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Istoriya Zemli vklyuchaet v sebya naibolee vazhnye sobytiya i osnovnye etapy razvitiya planety Zemlya s momenta eyo obrazovaniya i do nashih dnej Pochti vse otrasli estestvoznaniya vnesli svoj vklad v ponimanie osnovnyh sobytij proshlogo Zemli Vozrast Zemli sostavlyaet primerno tret ot vozrasta Vselennoj V etot promezhutok vremeni proizoshlo ogromnoe kolichestvo biologicheskih i geologicheskih izmenenij Geologicheskoe vremya v vide diagrammy izobrazhayushej otnositelnye razmery epoh v istorii Zemli Zemlya obrazovalas okolo 4 567 mlrd let nazad putyom akkrecii iz protoplanetnogo diska diskoobraznoj massy gaza pyli ostavshihsya ot obrazovaniya Solnca kotoraya i dala nachalo Solnechnoj sisteme Vulkanicheskaya degazaciya sozdala pervichnuyu atmosferu no v nej pochti ne bylo kisloroda i ona byla by toksichnoj dlya lyudej i sovremennoj zhizni v celom Bo lshaya chast Zemli byla rasplavlennoj iz za aktivnogo vulkanizma i chastyh stolknovenij s drugimi kosmicheskimi obektami Predpolagaetsya chto odno iz takih krupnyh stolknovenij privelo k naklonu zemnoj osi i formirovaniyu Luny So vremenem takie kosmicheskie bombardirovki prekratilis chto pozvolilo planete ostyt i obrazovat tvyorduyu koru Dostavlennaya na planetu kometami i asteroidami voda skondensirovalas v oblaka i okeany Zemlya stala prigodnoj dlya zhizni a samye rannie eyo formy obogatili atmosferu kislorodom Po krajnej mere pervyj milliard let zhizn na Zemle sushestvovala v malyh i mikroskopicheskih formah Okolo 580 millionov let nazad voznikla slozhnaya mnogokletochnaya zhizn a vo vremya kembrijskogo perioda ona perezhila process bystroj diversifikacii v bolshinstvo osnovnyh tipov Okolo shesti millionov let nazad ot gominid otdelilas liniya gominini chto privelo k poyavleniyu shimpanze i v dalnejshem k sovremennomu cheloveku S momenta eyo formirovaniya na nashej planete postoyanno proishodyat biologicheskie i geologicheskie izmeneniya Organizmy nepreryvno razvivayutsya prinimayut novye formy ili vymirayut v otvet na postoyanno menyayushuyusya planetu Process tektoniki plit igraet vazhnuyu rol v formirovanii okeanov i kontinentov Zemli a takzhe zhizni kotoroj oni dayut ubezhishe Biosfera v svoyu ochered okazala znachitelnoe vliyanie na atmosferu i drugie abioticheskie usloviya na planete takie kak obrazovanie ozonovogo sloya rasprostranenie kisloroda a takzhe sozdanie pochvy Hotya lyudi ne sposobny vosprinimat eto v svyazi s ih otnositelno korotkim periodom zhizni eti izmeneniya prodolzhayutsya i budut prodolzhatsya v techenie sleduyushih neskolkih milliardov let Geohronologicheskaya shkalaOsnovnaya statya Geohronologicheskaya shkala Istoriya Zemli v hronologicheskom poryadke organizovannaya v tablicu izvestna kak geohronologicheskaya shkala Shkala razbita na intervaly na osnove stratigraficheskogo analiza Milliony letFormirovanie Solnechnoj sistemyOsnovnaya statya Formirovanie i evolyuciya Solnechnoj sistemy Protoplanetnyj disk v predstavlenii hudozhnika Standartnoj modelyu formirovaniya Solnechnoj sistemy v tom chisle Zemli yavlyaetsya gipoteza solnechnoj tumannosti Po etoj teorii Solnechnaya sistema obrazovalas iz bolshogo vrashayushegosya oblaka mezhzvyozdnoj pyli i gaza kotoroe nazyvaetsya solnechnoj tumannostyu Ono sostoyalo iz vodoroda i geliya sozdannyh vskore posle Bolshogo vzryva 13 7 mlrd let nazad i bolee tyazhyolyh elementov vybroshennyh sverhnovymi Okolo 4 5 mlrd let nazad tumannost nachala sokrashatsya vozmozhno eto bylo vyzvano udarnoj volnoj sverhnovoj nepodalyoku Udarnaya volna takzhe mogla byt sozdana vrasheniem tumannosti Kogda oblako nachalo uskoryatsya ego uglovoj moment gravitaciya i inerciya splyusnuli ego v protoplanetnyj disk perpendikulyarno k ego osi vrasheniya V rezultate stolknovenij krupnyh oblomkov drug s drugom nachali formirovatsya protoplanety obrashayushiesya vokrug centra tumannosti Veshestvo v centre tumannosti ne imeya bolshogo uglovogo momenta szhalos i nagrelos v rezultate chego nachalsya yadernyj sintez vodoroda v gelij Posle eshyo bolshego sokrasheniya zvezda tipa T Telca vspyhnula i prevratilas v Solnce Mezhdu tem vo vneshnej oblasti tumannosti gravitaciya vyzvala process kondensacii vokrug vozmusheniya plotnosti i chastic pyli a ostalnaya chast protoplanetnogo diska nachala razdelyatsya na kolca V processe izvestnom kak akkreciya chasticy pyli i oblomki slipayutsya vmeste v bolee krupnye fragmenty obrazuya planety Takim obrazom formiruetsya Zemlya okolo 4 54 mlrd let nazad s pogreshnostyu 1 Etot process byl v osnovnom zavershyon v techenie 10 20 millionov let Solnechnyj veter novoobrazovannoj zvezdy tipa T Telca ochistil bolshuyu chast materii na diske kotoraya eshyo ne skondensirovalas v bolee krupnye tela Tot zhe samyj process budet proizvodit akkrecionnye diski vokrug prakticheski vseh novoobrazovannyh zvyozd vo Vselennoj nekotorye iz etih zvyozd priobretut planety Protozemlya uvelichilas za schyot akkrecii poka eyo poverhnost byla dostatochno goryachej chtoby rasplavlyat tyazhyolye siderofilnye elementy Metally obladaya bolee vysokoj plotnostyu chem silikaty pogruzilis vnutr Zemli Eta angl privela k razdeleniyu na primitivnuyu mantiyu i metallicheskoe yadro spustya vsego 10 millionov let posle togo kak Zemlya nachala formirovatsya proizvedya sloistuyu strukturu Zemli i sformirovav magnitnoe pole Zemli Pervaya atmosfera Zemli zahvachennaya iz solnechnoj tumannosti sostoyala iz lyogkih atmofilnyh elementov solnechnoj tumannosti v osnovnom vodoroda i geliya Sochetanie solnechnogo vetra i vysokoj temperatury poverhnosti novoobrazovannoj planety priveli k potere chasti atmosfery v rezultate chego v atmosfere v nastoyashee vremya procentnoe otnoshenie etih elementov k bolee tyazhyolym nizhe chem v kosmicheskom prostranstve Geologicheskaya istoriya ZemliOsnovnaya statya Geologicheskaya istoriya Zemli Geologicheskaya istoriya Zemli posledovatelnost sobytij v razvitii Zemli kak planety ot obrazovaniya gornyh porod vozniknoveniya i razrusheniya form relefa pogruzheniya sushi pod vodu otstupaniya morya oledeneniya do poyavleniya i ischeznoveniya zhivotnyh i rastenij i drugih sobytij geohronologicheskoj shkaly vremeni Sozdavalas glavnym obrazom na osnove izucheniya sloev gornyh porod planety stratigrafiya Iznachalno Zemlya byla rasplavlena i raskalena iz za silnogo vulkanizma i chastogo stolknoveniya s drugimi telami No v konce koncov vneshnij sloj planety ohlazhdaetsya i prevrashaetsya v Zemnuyu koru Nemnogo pozdnee po odnoj iz versij v rezultate stolknoveniya po kasatelnoj s nebesnym telom razmerom s Mars i massoj okolo 10 zemnoj obrazovalas Luna V rezultate bo lshaya chast veshestva udarivshegosya obekta i chast veshestva zemnoj mantii byli vybrosheny na okolozemnuyu orbitu Iz etih oblomkov sobralas proto Luna i nachala obrashatsya po orbite s radiusom okolo 60 000 km Zemlya v rezultate udara poluchila rezkoe uvelichenie skorosti vrasheniya sovershaya odin oborot za 5 chasov i zametnyj naklon osi vrasheniya Degazaciya i vulkanicheskaya aktivnost sozdala pervuyu atmosferu na Zemle Kondensaciya vodyanogo para a takzhe lyod iz stalkivayushihsya s Zemlyoj komet obrazovali okeany Na protyazhenii soten millionov let poverhnost planety postoyanno izmenyalas kontinenty formirovalis i raspadalis Oni migrirovali po poverhnosti inogda obedinyayas i formiruya superkontinent Primerno 750 mln let nazad superkontinent Rodiniya rannij iz izvestnyh nachal raspadatsya Pozdnee s 600 do 540 millionov let nazad kontinenty sformirovali Pannotiyu i nakonec Pangeyu kotoraya raspalas 180 mln let nazad Sovremennaya lednikovaya era nachalas okolo 40 mln let nazad a zatem usililas v konce pliocena Polyarnye regiony s teh por preterpeli povtoryayushiesya cikly oledeneniya i tayaniya povtoryayushiesya kazhdye 40 100 tys let Poslednyaya lednikovaya epoha tekushego lednikovogo perioda zakonchilas okolo 10 000 let nazad Vozrast ZemliOsnovnaya statya Vozrast Zemli Vozrast Zemli vremya kotoroe proshlo s momenta obrazovaniya Zemli kak samostoyatelnogo planetarnogo tela Soglasno sovremennym nauchnym dannym vozrast Zemli sostavlyaet 4 54 milliarda let 4 54 109 let 1 Eti dannye baziruyutsya na radiometricheskoj datirovke vozrasta meteoritnyh obrazcov hondritov obrazovavshihsya do nachala formirovaniya planet i sootvetstvuyut vozrastu starejshih zemnyh i lunnyh obrazcov Posle nauchnoj revolyucii i razvitiya metodov radiometricheskoj datirovki vozrasta okazalos chto mnogie obrazcy mineralov imeyut vozrast bolee milliarda let Starejshie iz najdennyh na dannyj moment melkie kristally cirkona iz Dzhek Hilz v Zapadnoj Avstralii ih vozrast ne menee 4404 milliona let Na osnove sravneniya massy i svetimosti Solnca i drugih zvyozd byl sdelan vyvod chto Solnechnaya sistema ne mozhet byt namnogo starshe etih kristallov Konkrecii bogatye kalciem i alyuminiem vstrechayushiesya v meteoritah samye starye izvestnye obrazcy kotorye sformirovalis v predelah Solnechnoj sistemy ih vozrast 4567 millionov let chto dayot vozmozhnost ustanovit vozrast Solnechnoj sistemy i verhnyuyu granicu vozrasta Zemli Sushestvuet gipoteza chto formirovanie Zemli nachalos vskore posle obrazovaniya kalcij alyuminievyh konkrecij i meteoritov Poskolku tochnoe vremya obrazovaniya Zemli neizvestno i razlichnye modeli dayut rashozhdenie ot neskolkih millionov do 100 millionov let tochnyj vozrast planety trudno opredelit Krome togo trudno opredelit absolyutno tochnyj vozrast starejshih porod vyhodyashih na poverhnost Zemli poskolku oni sostavleny iz mineralov raznogo vozrasta Istoriya zhizni na ZemleOsnovnaya statya Istoriya zhizni na Zemle Hronologiya evolyucii Istoriya zhizni na Zemle nachalas s momenta poyavleniya pervogo zhivogo sushestva 3 7 milliarda let nazad i prodolzhaetsya po sej den Shodstvo mezhdu vsemi organizmami ukazyvayut na nalichie obshego predka ot kotorogo proizoshli vse drugie zhivye sushestva Cianobakterialnye maty i arhei byli dominiruyushej formoj zhizni v nachale arhejskogo eona i yavilis ogromnym evolyucionnym shagom togo vremeni Kislorodnyj fotosintez poyavivshijsya okolo 2500 millionov let nazad v konechnom itoge privyol k oksigenacii atmosfery kotoraya nachalas primerno 2400 mln let nazad Samye rannie svidetelstva eukariot datiruyutsya 1850 mln let nazad hotya vozmozhno oni poyavilis ranee diversifikaciya eukariot uskorilas kogda oni nachali ispolzovat kislorod v metabolizme Pozzhe okolo 1700 mln let nazad stali poyavlyatsya mnogokletochnye organizmy s differencirovannymi kletkami dlya vypolneniya specializirovannyh funkcij Primerno 1200 mln let nazad poyavlyayutsya pervye vodorosli a uzhe primerno 450 mln let nazad pervye vysshie rasteniya Bespozvonochnye zhivotnye poyavilis v ediakarskom periode a pozvonochnye voznikli okolo 525 millionov let nazad vo vremya kembrijskogo vzryva Vo vremya permskogo perioda iz krupnyh pozvonochnyh preobladali sinapsidy vozmozhnye predki mlekopitayushih no sobytiya permskogo vymiraniya 251 mln let nazad unichtozhili 96 vseh morskih vidov i 70 nazemnyh vidov pozvonochnyh v tom chisle i sinapsidov V periode vosstanovleniya posle etoj katastrofy arhozavry stali naibolee rasprostranyonnymi nazemnymi pozvonochnymi i vytesnili terapsid v seredine triasa V konce triasa arhozavry dali nachalo dinozavram kotorye dominirovali v techenie yurskogo i melovogo periodov Predki mlekopitayushih v to vremya predstavlyali soboj nebolshih nasekomoyadnyh zhivotnyh Posle mel paleogenovogo vymiraniya 65 millionov let nazad vse dinozavry vymerli ostaviv posle sebya proizoshedshuyu ot nih evolyucionnuyu vetv ptic Posle etogo mlekopitayushie stali bystro uvelichivatsya v razmerah i raznoobrazii tak kak teper im pochti nikto ne sostavlyal konkurenciyu Takie massovye vymiraniya vozmozhno uskoryali evolyuciyu putyom predostavleniya vozmozhnosti novym gruppam organizmov k diversifikacii Iskopaemye ostatki pokazyvayut chto cvetkovye rasteniya poyavilis v rannem melovom periode 130 millionov let nazad i veroyatno pomogli evolyucionirovat opylyayushim nasekomym Socialnye nasekomye poyavilis primerno v to zhe vremya chto i cvetkovye rasteniya Hotya oni zanimayut lish nebolshuyu chast rodoslovnoj nasekomyh v nastoyashee vremya oni sostavlyayut bolee poloviny ih obshego kolichestva Lyudi yavlyayutsya odnimi iz primatov nachavshih hodit vertikalno okolo 6 mln let nazad Hotya razmer mozga ih predkov byl sravnim s razmerom mozga drugih gominid naprimer shimpanze on nachal uvelichivatsya 3 mln let nazad Katarhej i arhejOsnovnye stati Katarhej i Arhej Pervyj eon v istorii Zemli Katarhej nachinaetsya s formirovaniya Zemli i prodolzhaetsya do arhejskogo eona 3 8 mlrd let nazad 145 Drevnejshie najdennye na Zemle porody datiruyutsya primerno 4 0 mlrd let a samyj staryj oblomochnyj kristall cirkona v skale okolo 4 4 mlrd let vskore posle obrazovaniya zemnoj kory i samoj Zemli Gipoteza gigantskogo stolknoveniya dlya formirovaniya Luny glasit chto vskore posle formirovaniya nachalnoj kory proto Zemlya stolknulas s menshej protoplanetoj v rezultate chego v kosmos byla vybroshena chast mantii i kory i sozdalas Luna Ispolzuya metod angl na drugih nebesnyh telah mozhno sdelat vyvod chto period intensivnogo vozdejstviya meteoritov nazyvaemyj pozdnej tyazhyoloj bombardirovkoj byl okolo 4 1 mlrd let nazad i zakonchilsya okolo 3 8 mlrd let nazad v konce Katarheya Krome togo byl silnyj vulkanizm v svyazi s bolshim potokom tepla i geotermalnym gradientom Tem ne menee izuchenie oblomochnyh kristallov cirkona vozrastom 4 4 mlrd let pokazalo chto oni podverglis kontaktu s zhidkoj vodoj i predpolagaetsya chto planeta uzhe imela okeany i morya v to vremya K nachalu arheya Zemlya silno ohladilas Bolshinstvo sovremennyh form zhizni ne smogli by vyzhit v pervichnoj atmosfere v kotoroj ne hvatalo kisloroda i ozonovogo sloya Tem ne menee schitaetsya chto iznachalnaya zhizn stala razvivatsya v nachale arheya s kandidatom v okamenelosti datiruyushimsya okolo 3 5 mlrd let Nekotorye uchyonye dazhe polagayut chto zhizn mogla nachatsya v nachale Katarheya eshyo 4 4 mlrd let nazad vozmozhno sohranivshis v pozdnij period tyazhyoloj bombardirovki v gidrotermalnyh istochnikah pod poverhnostyu Zemli Poyavlenie Luny Stolknovenie Zemli s planetoj Tejya v predstavlenii hudozhnika Osnovnye stati Luna i Teoriya gigantskogo stolknoveniya Otnositelno bolshoj prirodnyj sputnik Zemli Luna bolshe po otnosheniyu k svoej planete chem lyuboj drugoj sputnik v Solnechnoj sisteme Vo vremya programmy Apollo s poverhnosti Luny byli dostavleny na Zemlyu gornye porody Radiometricheskaya datirovka etih porod pokazala chto Lune 4 53 0 01 milliarda let i voznikla ona po krajnej mere cherez 30 millionov let posle togo kak Solnechnaya sistema byla sformirovana Novye dannye svidetelstvuyut o tom chto Luna sformirovalas eshyo pozzhe 4 48 0 02 mlrd let nazad ili spustya 70 110 millionov let posle vozniknoveniya solnechnoj sistemy Teorii formirovaniya Luny dolzhny obyasnit eyo pozdnee formirovanie a takzhe sleduyushie fakty Vo pervyh Luna imeet nizkuyu plotnost v 3 3 raza bolshe chem voda po sravneniyu s 5 5 Zemli i nebolshoe metallicheskoe yadro Vo vtoryh na Lune prakticheski net vody ili drugih letuchih veshestv V tretih Zemlya i Luna imeyut odinakovye izotopnye podpisi kisloroda otnositelnoe soderzhanie izotopov kisloroda Iz teorij kotorye byli predlozheny dlya obyasneniya etih faktov tolko odna poluchila shirokoe priznanie gipoteza gigantskogo stolknoveniya predpolagaet chto Luna poyavilas v rezultate togo chto obekt razmerom s Mars udaril po protozemle skolzyashim udarom 256 V rezultate stolknoveniya etogo obekta kotoryj inogda nazyvayut Tejya s Zemlyoj bylo vydeleno primerno v 100 mln raz bolshe energii chem v rezultate vozdejstviya kotoroe vyzvalo vymiranie dinozavrov Etogo bylo dostatochno dlya ispareniya nekotoryh vneshnih sloev Zemli i rasplavleniya oboih tel 256 Chast mantii byla vybroshena na orbitu vokrug Zemli Eta gipoteza predskazyvaet pochemu Luna byla obdelena metallicheskim materialom i obyasnyaet eyo neobychnyj sostav Veshestvo vybroshennoe na orbitu vokrug Zemli moglo skondensirovatsya v edinoe telo v techenie neskolkih nedel Pod vliyaniem sobstvennoj tyazhesti vybroshennyj material prinyal sfericheskuyu formu i obrazovalas Luna Pervye kontinenty angl process kotoryj upravlyaet tektonikoj plit segodnya yavlyaetsya rezultatom teplovogo potoka iz nedr Zemli k eyo poverhnosti 2 Ona vklyuchaet v sebya sozdanie tvyordyh tektonicheskih plit v sredinno okeanicheskih hrebtah Eti plity razrushayutsya subdukciej v mantii v zonah subdukcii V nachale arheya okolo 3 0 mlrd let v mantii bylo namnogo zharche chem segodnya veroyatno okolo 1600 C 82 to est konvekciya v mantii proishodila bystree Poetomu process shodnyj s sovremennoj tektonikoj plit takzhe dolzhen byl proishodit bystree Vpolne veroyatno chto vo vremya katarheya i arheya zon subdukcii bylo bolshe i poetomu tektonicheskie plity byli menshe 258 Pervonachalnaya kora obrazovavshayasya na poverhnosti Zemli c pervym zatverdevaniem polnostyu ischezla iz za etoj bystroj tektoniki plit v Katarhee i intensivnogo vozdejstviya pozdnej tyazhyoloj bombardirovki Tem ne menee schitaetsya chto ona imela bazaltovyj sostav kak i okeanicheskaya kora segodnya potomu chto differenciaciya kory eshyo ne proizoshla 258 Pervye bolshie uchastki kontinentalnoj kory kotorye yavlyayutsya produktom differenciacii lyogkih elementov v rezultate angl v nizhnej kore poyavilis v konce Katarheya okolo 4 0 mlrd let nazad To chto ostalos ot etih pervyh nebolshih kontinentov nazyvayut kratonami Eti chasti kory pozdnego katarheya i rannego arheya formiruyut yadra vokrug kotoryh segodnya vyrosli kontinenty Naibolee drevnie porody na Zemle nahodyatsya v Severo amerikanskom kratone v Kanade Eto tonality vozrastom okolo 4 0 mlrd let Oni imeyut sledy vozdejstviya vysokih temperatur a takzhe osadochnye zerna kotorye byli okrugleny eroziej vo vremya peremesheniya po vode chto yavlyaetsya svidetelstvom sushestvovaniya rek i morej v to vremya Kratony sostoyat v osnovnom iz dvuh chereduyushihsya tipov terrejnov Pervye tak nazyvaemye zelenokamennye poyasa sostoyat iz nizkosortnyh metamorfizovannyh osadochnyh porod Eti zelyonye kamni pohozhi na otlozheniya kotorye segodnya mozhno najti v okeanicheskih vpadinah vyshe zony subdukcii Po etoj prichine zelyonye kamni inogda rassmatrivayutsya kak svidetelstva subdukcii v arhee Vtoroj tip predstavlyaet soboj kompleks iz kislyh magmaticheskih porod Eti porody v osnovnom tipa tonalit ili granodiorit blizkie po sostavu k granitu otsyuda takih terrejnov nazyvayut TTG terrejnami TTG kompleksy rassmatrivayutsya kak relikty pervoj kontinentalnoj kory obrazovannye v rezultate chastichnogo rasplavleniya v bazaltah Chapter 5 Atmosfera i okeany Grafik izmeneniya parcialnogo davleniya kisloroda na protyazhenii geologicheskoj istoriiSm takzhe Proishozhdenie vody na Zemle Chasto govoryat chto Zemlya imela tri atmosfery Pervaya atmosfera zahvachennaya iz solnechnoj tumannosti sostoyala iz lyogkih atmofilnyh elementov solnechnoj tumannosti v osnovnom vodoroda i geliya Sochetanie solnechnogo vetra i tepla zemli priveli k potere atmosfery v rezultate chego v atmosfere v nastoyashee vremya soderzhit otnositelno menshe etih elementov po sravneniyu s kosmicheskimi prostranstvom Vtoraya atmosfera sformirovalas v rezultate stolknoveniya i posleduyushej vulkanicheskoj deyatelnosti V etoj atmosfere bylo mnogo parnikovyh gazov no malo kisloroda 256 Nakonec tretya atmosfera bogataya kislorodom voznikla kogda bakterii nachali proizvodit kislorod okolo 2 8 mlrd let nazad 83 84 116 117 V rannih modelyah formirovaniya atmosfery i okeana vtoraya atmosfera byla sformirovana v rezultate degazacii letuchih veshestv iz nedr Zemli V nastoyashee vremya schitaetsya bolee veroyatnym chto mnogie iz letuchih veshestv poyavilis vo vremya akkrecii v rezultate processa izvestnogo kak degazaciya pri stolknovenii v kotorom stalkivayushiesya tela isparyayutsya pri udare Poetomu okean i atmosfera nachali formirovatsya kak tolko Zemlya sformirovalas Novaya atmosfera veroyatno soderzhala vodyanoj par uglekislyj gaz azot i nebolshie kolichestva drugih gazov Planetezimal na rasstoyanii 1 astronomicheskoj edinicy a e rasstoyanie Zemli ot Solnca vozmozhno ne sposobstvuet sushestvovaniyu vody na Zemle potomu chto solnechnaya tumannost byla slishkom goryacha dlya lda a gidrataciya porod v vodyanoj par zajmyot slishkom mnogo vremeni Voda dolzhna byt dostavlena meteoritami iz vneshnego poyasa asteroidov i nekotorymi krupnymi zarodyshami planet nahodivshihsya na rasstoyanii bolee 2 5 a e Komety takzhe mogli vnesti svoj vklad Hotya bolshinstvo komet segodnya nahodyatsya na orbitah dalshe ot Solnca chem Neptun kompyuternoe modelirovanie pokazyvaet chto oni iznachalno byli gorazdo bolee rasprostranyonnym yavleniem vo vnutrennej chasti solnechnoj sistemy 130 132 S ohlazhdeniem planety obrazovalis oblaka Dozhd sozdal okeany Poslednie dannye svidetelstvuyut chto okeany vozmozhno nachali formirovatsya eshyo 4 4 mlrd let nazad K nachalu arheya oni uzhe pokryli Zemlyu Stol rannee obrazovanie bylo trudno obyasnit iz za problemy izvestnoj kak paradoks slabogo molodogo Solnca Zvyozdy stanovyatsya bolee yarkimi kogda stareyut i vo vremya formirovaniya Zemli Solnce izluchalo tolko 70 ego nyneshnej energii Mnogie modeli predskazyvayut chto Zemlya byla by pokryta ldom Veroyatno resheniem yavlyaetsya to chto v atmosfere bylo dostatochno uglekislogo gaza i metana dlya sozdaniya parnikovogo effekta Vulkany proizvodili uglekislyj gaz a rannie mikroby metan Drugoj parnikovyj gaz ammiak vybrasyvalsya vulkanami no bystro razrushalsya pod vozdejstviem ultrafioletovogo izlucheniya 83 Proishozhdenie zhizni Osnovnaya statya Proishozhdenie zhizni Odna iz prichin interesa k rannim atmosfere i okeanu v tom chto oni formiruyut usloviya vozniknoveniya zhizni Est mnogo modelej no malo soglasiya v tom kak iz nezhivyh himicheskih veshestv voznikla zhizn Himicheskie sistemy kotorye byli sozdany v laboratoriyah vse eshyo otstayut ot minimalnoj slozhnosti dlya zhivogo organizma Pervym shagom k poyavleniyu zhizni vozmozhno byli himicheskie reakcii sozdayushie mnogie prostye organicheskie soedineniya vklyuchaya nukleinovye i aminokisloty kotorye yavlyayutsya stroitelnymi blokami zhizni Eksperiment Stenli Millera i Garolda Yuri v 1953 godu pokazal chto takie molekuly mogut obrazovyvatsya v atmosfere nasyshennoj vodoj metanom ammiakom i vodorodom pri pomoshi elektricheskoj iskry imitiruyushej effekt molnii Nesmotrya na to chto sostav atmosfery Zemli veroyatno otlichalsya ot sostava ispolzovavshegosya Millerom i Yuri v posleduyushih eksperimentah s bolee realistichnym sostavom takzhe udalos sintezirovat organicheskie molekuly Nedavno kompyuternoe modelirovanie pokazalo chto organicheskie molekuly mogli obrazovatsya v protoplanetnom diske do obrazovaniya Zemli Sleduyushij etap v proishozhdenii zhizni mozhet byt reshyon po menshej mere odnoj iz tryoh vozmozhnyh otpravnyh tochek samovosproizvedenie sposobnost organizma proizvodit potomstvo ochen pohozhee na sebya obmen veshestv sposobnost pitatsya i vosstanavlivat sebya i kletochnye membrany pozvolyayushie potreblyat pishu i vyvodit othody no isklyuchayushee popadanie nezhelatelnyh veshestv Snachala vosproizvedenie RNK mir Replikatorom v prakticheski vseh izvestnyh formah zhizni yavlyaetsya dezoksiribonukleinovaya kislota DNK yavlyaetsya gorazdo bolee slozhnoj chem pervonachalnyj replikatorOsnovnaya statya Gipoteza mira RNK Dazhe samye prostye chleny tryoh sovremennyh domenov zhizni ispolzuyut DNK chtoby zapisat svoi recepty v geneticheskuyu pamyat i slozhnyj kompleks RNK i belkovyh molekul chtoby chitat eti instrukcii i ispolzovat ih dlya rosta podderzhaniya i samovosproizvedeniya Otkrytie togo chto nekotorye tipy molekuly RNK nazyvayushiesya ribozimami mogut katalizirovat kak samovosproizvedenie tak i stroitelstvo belkov privelo k gipoteze chto rannie formy zhizni byli osnovany isklyuchitelno na RNK Oni mogli obrazovat mir RNK v kotorom byli osobi a ne vidy a mutacii i gorizontalnye perenosy genov oznachali by chto potomstvo v kazhdom pokolenii vesma veroyatno imelo genomy otlichnye ot teh kotorye byli u ih roditelej RNK pozzhe byla zamenena na DNK kotoraya yavlyaetsya bolee stabilnoj i sledovatelno mozhno postroit bolee dlinnye genomy rasshiryaya spektr vozmozhnostej kotorye mozhet imet edinyj organizm Ribozimy ostayutsya osnovnymi komponentami ribosomov fabriki belka sovremennoj kletki Nesmotrya na to chto korotkie samovosproizvodyashiesya molekuly RNK byli iskusstvenno polucheny v laboratorii voznikli somneniya o tom chto nebiologicheskij sintez RNK vozmozhen v prirode Pervye ribozimy mogli byt obrazovany iz prostejshih nukleinovyh kislot takih kak PNK TNK i angl kotorye byli by pozzhe zameneny na RNK Takzhe byli predlozheny drugie do RNK replikatory v tom chisle kristally 150 i dazhe kvantovye sistemy V 2003 godu bylo predpolozheno chto poristyj precipitat sulfidov metallov budet sposobstvovat sintezu RNK pri temperature okolo 100 C i davlenii kak na okeanicheskom dne vblizi gidrotermalnyh istochnikov V etoj gipoteze lipidnye membrany poyavyatsya poslednimi iz osnovnyh komponentov kletki a do togo vremeni protokletki budut ogranichivatsya ispolzovaniem por Snachala metabolizm zhelezo sernyj mir Osnovnaya statya Teoriya zhelezo sernogo mira Drugaya davnyaya gipoteza zaklyuchaetsya v tom chto pervaya zhizn sostoit iz belkovyh molekul Aminokisloty stroitelnye bloki belkov legko sinteziruyutsya v pravdopodobnyh prebioticheskih usloviyah kak i malye peptidy polimery aminokislot kotorye proizvodyat horoshie katalizatory 295 297 Serii eksperimentov provedyonnye nachinaya s 1997 goda pokazali chto aminokisloty i peptidy mogut obrazovyvatsya v prisutstvii okisi ugleroda i serovodoroda s sulfidom zheleza i sulfidom nikelya v kachestve katalizatorov Bolshinstvo iz shagov dlya ih sozdaniya trebuet temperaturu okolo 100 C i umerennoe davlenie hotya odin etap trebuet 250 C i davlenie ekvivalentnoe tomu chto sushestvuet na glubine 7 km pod zemlyoj Poetomu samopodderzhivayushijsya sintez belkov mog proizojti vozle angl Trudnost s metabolizmom v kachestve pervogo shaga zaklyuchaetsya v tom chtoby najti sposob s pomoshyu kotorogo organizmy mogut razvivatsya Ne imeya vozmozhnosti samovosproizvedeniya skopleniya molekul dolzhny imet kompozicionnye genomy schyotchiki molekulyarnyh vidov v skopleniyah v kachestve celi estestvennogo otbora Tem ne menee poslednie modeli pokazyvayut chto takaya sistema ne mozhet razvivatsya v otvet na estestvennyj otbor Snachala membrany lipidnyj mir Bylo vyskazano predpolozhenie chto vozmozhno pervym vazhnym shagom byli puzyri lipidov s dvojnymi stenkami podobnye tem kotorye formiruyut vneshnie membrany kletok Eksperimenty kotorye modelirovali usloviya rannej Zemli prodemonstrirovali formirovanie lipidov i to chto oni mogut samoproizvolno obrazovyvat samovosproizvodyashiesya puzyri liposom s dvojnymi stenkami Hotya oni principialno ne yavlyayutsya informacionnym nositelyami takimi kak nukleinovye kisloty oni mogut podpadat pod dejstvie estestvennogo otbora na protyazhenii ih zhizni i razmnozheniya V dalnejshem vnutri liposom mogut bolee legko sformirovatsya nukleinovye kisloty takie kak RNK chem esli by oni byli snaruzhi Teoriya gliny Nekotorye gliny v chastnosti montmorillonit obladayut svojstvami kotorye delayut ih pravdopodobnymi uskoritelyami dlya vozniknoveniya mira RNK oni rastut v rezultate samovosproizvedeniya ih kristallicheskoj struktury i podchinyayutsya analogu estestvennogo otbora kak glina poroda kotoraya rastyot bystree v opredelyonnoj srede i bystro stanovitsya dominiruyushej a takzhe mogut katalizirovat obrazovanie molekul RNK Hotya eta ideya ne obrela nauchnogo konsensusa ona vse eshyo imeet aktivnyh storonnikov 150 158 Issledovaniya v 2003 godu pokazali chto montmorillonit takzhe mozhet uskorit preobrazovaniya zhirnyh kislot v puzyri i to chto puzyri mogut inkapsulirovat RNK dobavlennye k gline Pogloshaya dopolnitelnye lipidy puzyri mogut rasti i delitsya Podobnye processy vozmozhno pomogali v formirovanii pervyh kletok Pohozhaya gipoteza predstavlyaet samovosproizvodyashiesya bogatye zhelezom gliny kak predshestvenniki nukleotidov lipidov i aminokislot Poslednij obshij predok Osnovnaya statya Poslednij universalnyj obshij predok Schitaetsya chto iz mnozhestva razlichnyh protokletok vyzhila tolko odna liniya Imeyushiesya dannye pokazyvayut chto filogeneticheskij poslednij universalnyj obshij predok LUCA zhil v nachale arhejskogo eona vozmozhno 3 5 mlrd let nazad ili ranshe Eta LUCA kletka yavlyaetsya predkom vseh sovremennyh zhivyh sushestv na Zemle Eto byl veroyatno prokariot obladavshij kletochnoj membranoj i veroyatno ribosomami no bez yadra ili membrannoj organelly takoj kak mitohondrii ili hloroplasty Kak i vse sovremennye kletki on ispolzoval DNK v kachestve geneticheskogo koda RNK dlya peredachi informacii i sintez belkov i fermentov dlya katalizirovaniya reakcij Nekotorye uchyonye schitayut chto vmesto odnogo organizma kotoryj yavlyalsya poslednim universalnym obshim predkom byli populyacii organizmov obmenivavshihsya genami ispolzuya gorizontalnyj perenos genov ProterozojOsnovnaya statya Proterozoj Proterozoj prodolzhalsya s 2 5 mlrd do 542 mln let nazad 130 V etot promezhutok vremeni kratony vyrosli do materikov sovremennyh razmerov Vazhnejshim izmeneniem stalo poyavlenie bogatoj kislorodom atmosfery Zhizn sovershila put ot prokariot v eukarioty i mnogokletochnye formy Soglasno odnoj iz rasprostranyonnyh gipotez v proterozoe proizoshli neskolko silnyh oledenenij nazyvaemyh Zemlya snezhok Posle poslednej Zemli snezhka okolo 600 mln let evolyuciya zhizni na Zemle uskoryaetsya Okolo 580 mln let nazad ediakarskaya biota formiruyutsya usloviya dlya kembrijskogo vzryva Kislorodnaya revolyuciya Osnovnaya statya Kislorodnaya katastrofa Sm takzhe Ozonovyj sloj Litificirovannye stromatolity na beregu ozera Tetis Zapadnaya Avstraliya Arhejskie stromatolity pervye pryamye iskopaemye sledy zhizni na Zemle Zhelezistye formacii 3 15 mlrd let iz gruppy Moories zelenokamennogo poyasa Barbertona Yuzhnaya Afrika Krasnye sloi sformirovalis v te vremena kogda kislorod byl dostupen serye sloi byli sformirovany v beskislorodnyh usloviyah Pervye kletki pogloshali energiyu i produkty pitaniya iz okruzhayushej sredy vokrug nih Oni ispolzovali brozhenie raspad bolee slozhnyh soedinenij v menee slozhnye s menshej energiej i ispolzovali osvobozhdyonnuyu energiyu dlya rosta i razmnozheniya Brozhenie mozhet proishodit tolko v anaerobnoj beskislorodnoj srede Poyavlenie fotosinteza pozvolilo kletkam proizvodit svoi sobstvennye produkty pitaniya 377 Bolshaya chast zhizni kotorye pokryvaet poverhnost Zemli zavisit pryamo ili kosvenno ot fotosinteza Naibolee rasprostranyonnaya forma kislorodnyj fotosintez prevrashaet uglekislyj gaz vodu i solnechnyj svet v pishu Etot process preobrazuet energiyu solnechnogo sveta v bogatye energiej molekuly takie kak ATF kotorye zatem obespechivayut energiyu chtoby proizvodit sahar Dlya dostavki elektronov v oborot vodorod izvlekaetsya iz vody otbrasyvaya kislorod v kachestve pobochnogo produkta Nekotorye organizmy v tom chisle purpurnye bakterii i zelyonye sernye bakterii ispolzuyut formu beskislorodnogo fotosinteza Vmesto vodoroda eti organizmy izvlekayut iz vody donory elektronov takie kak serovodorod sera i zhelezo Takie organizmy v osnovnom ogranichivayutsya zhiznyu v ekstremalnyh usloviyah v takih kak goryachie i gidrotermalnye istochniki 379 382 Prostejshie beskislorodnye formy poyavilis okolo 3 8 mlrd let nazad vskore posle poyavleniya zhizni Vremya poyavleniya kislorodnogo fotosinteza yavlyaetsya bolee spornym on bezuslovno poyavilsya okolo 2 4 mlrd let nazad no nekotorye issledovateli otodvigayut vremya ego poyavleniya do 3 2 mlrd let Pozzhe globalnaya proizvoditelnost veroyatno povysilas po krajnej mere na dva ili tri poryadka Samymi starymi ostatkami form zhizni proizvodivshih kislorod yavlyayutsya iskopaemye stromatolity Snachala osvobozhdyonnyj kislorod svyazyvalsya izvestnyakami zhelezom i drugimi mineralami Okislennoe zhelezo vyglyadit kak krasnyj sloj v geologicheskih plastah i nazyvaetsya angl Eti sloi obrazuyutsya v izobilii v techenie siderijskogo perioda mezhdu 2500 i 2300 mln let nazad Kogda bolshaya chast svobodnyh mineralov okislilas kislorod nakonec nachinaet nakaplivatsya v atmosfere Hotya kazhdaya kletka proizvodit tolko neznachitelnoe kolichestvo kisloroda obedinyonnyj metabolizm vo mnogih kletkah v techenie dlitelnogo vremeni preobrazuet atmosferu Zemli v eyo sovremennoe sostoyanie Eto byla tretya zemnaya atmosfera 50 51 83 84 116 117 Pod vozdejstviem ultrafioletovogo izlucheniya nekotoroe kolichestvo kisloroda preobrazuetsya v ozon kotoryj sobiraetsya v sloj vblizi verhnej chasti atmosfery Ozonovyj sloj pogloshaet znachitelnuyu chast ultrafioletovogo izlucheniya kotoryj kogda to svobodno prohodil cherez atmosferu Eto pozvolilo kletkam kolonizirovat poverhnosti okeana i v konce koncov zemlyu Bez ozonovogo sloya ultrafioletovoe izluchenie bombardirovalo by sushu i more i vyzyvalo by neustojchivyj uroven mutacij v kletkah 219 220 Fotosintez vyzval eshyo odin vazhnyj effekt Kislorod byl toksichen i mnogie formy zhizni na Zemle veroyatno vymerli kogda uroven kisloroda rezko vyros v tak nazyvaemoj kislorodnoj katastrofe Ustojchivye formy vyzhili i procvetayut a nekotorye razvili sposobnost ispolzovat kislorod usiliv svoj metabolizm i poluchaya bolshe energii iz togo zhe obyoma pishi Zemlya snezhok Osnovnaya statya Zemlya snezhok V rezultate estestvennoj evolyucii Solnce davalo vsyo bolshe sveta v arhee i proterozoe svetimost Solnca povyshaetsya na 6 kazhdyj milliard let 165 V rezultate Zemlya stala poluchat bolshe tepla ot Solnca v proterozoe Tem ne menee Zemlya ne nagrevaetsya Vmesto etogo geologicheskie zapisi pokazyvayut chto v nachale proterozoya Zemlya znachitelno ohlazhdaetsya Lednikovye otlozheniya najdennye v Yuzhnoj Afrike datiruyutsya 2 2 mlrd let a dannye paleomagnitnyh izmerenij ukazyvayut na ih polozhenie v rajone ekvatora Takim obrazom oledenenie izvestnoe kak Guronskoe oledenenie vozmozhno bylo globalnym Nekotorye uchyonye predpolagayut chto eto i posleduyushie proterozojskie lednikovye periody byli nastolko seryoznymi chto planeta byla polnostyu zamorozhena ot polyusov do ekvatora Eta gipoteza nazyvaetsya Zemlya snezhok Lednikovyj period okolo 2 3 mlrd let nazad mog byt vyzvan uvelicheniem koncentracii kisloroda v atmosfere chto privelo k umensheniyu metana CH4 v atmosfere Metan yavlyaetsya silnym parnikovym gazom no s kislorodom reagiruet s obrazovaniem CO2 menee effektivnym parnikovym gazom 172 Kogda svobodnyj kislorod poyavilsya v atmosfere koncentraciya metana mogla rezko snizitsya chego stalo dostatochno dlya borby s effektom uvelicheniya teplovogo potoka ot Solnca Vozniknovenie eukariot Osnovnaya statya Eukarioty Hloroplasty v kletkah mha Sovremennaya sistematika klassificiruet zhizn tremya domenami Vremya vozniknoveniya etih domenov yavlyaetsya neopredelyonnym Bakterii veroyatno pervye otdelilis ot drugih form zhizni inogda nazyvaemyh Neomura no eto predpolozhenie yavlyaetsya spornym Vskore posle etogo 2 mlrd let nazad proizoshlo razdelenie Neomura na arhei i eukarioty Eukarioticheskie kletki eukarioty bolshe i slozhnee prokarioticheskih kletok bakterij i arhej i proishozhdenie etoj slozhnosti tolko sejchas stanovitsya izvestno Primerno v eto zhe vremya poyavilas pervaya proto mitohondriya Bakterialnaya kletka rodstvennaya sovremennoj Rikketsii kotoraya v rezultate evolyucii priobrela vozmozhnost kislorodnogo metabolizma voshla v bolshuyu prokarioticheskuyu kletku kotoroj ne hvatalo etoj vozmozhnosti Vozmozhno bolshaya kletka pytalas perevarit menshuyu no ne udalos vozmozhno eto svyazano s razvitiem zashity u zhertvy Menshaya kletka vozmozhno pytalas parazitirovat v bolshej V lyubom sluchae menshaya kletka vyzhila v bolshej Ispolzuya kislorod ona metaboliziruet othody bolshoj kletki i proizvodit bolshe energii Chast etoj izbytochnoj energii vozvrashaetsya hozyainu Menshaya kletka razmnozhaetsya vnutri bolshoj Vskore razvilsya ustojchivyj simbioz mezhdu bolshoj i maloj kletkoj v nej So vremenem kletka hozyain priobrela nekotorye iz genov menshej kletki i eti dva vida stali zavisimymi drug ot druga bolshaya kletka ne mozhet sushestvovat bez energii proizvedyonnoj maloj a ta v svoyu ochered ne mozhet vyzhit bez materialov predostavlyaemyh bolshoj kletkoj Vsya kletka v nastoyashee vremya schitaetsya edinym organizmom a malye kletki klassificiruyutsya kak organelly i nazyvayutsya mitohondriyami Analogichnyj sluchaj proizoshyol kogda fotosinteziruyushaya cianobakteriya vnedrilas v krupnuyu geterotrofnuyu kletku i stala hloroplastom 60 61 536 539 Veroyatno v rezultate etih izmenenij liniya kletok sposobnyh k fotosintezu otdelilas ot drugih eukariot bolee 1 mlrd let nazad Veroyatno bylo neskolko takih sobytij vklyuchenij Krome etih ustoyavshihsya endosimbioticheskih teorij kletochnogo proishozhdeniya mitohondrii i hloroplasta est teorii chto kletki vnedrilis v peroksisomy spirohety v resnichki i zhgutikovye i chto vozmozhno DNK virusy vnedrilis v kletochnoe yadro hotya ni odna iz nih ne poluchila shirokogo priznaniya Arhei bakterii i eukarioty prodolzhayut uvelichivat svoyo raznoobrazie i stanovyatsya vse bolee slozhnymi i luchshe prisposoblennymi k okruzhayushej srede Kazhdyj domen neodnokratno razbit na neskolko linij odnako malo chto izvestno ob istorii arhej i bakterij Okolo 1 1 mlrd let nazad sformirovalsya superkontinent Rodiniya Linii rastenij zhivotnyh i gribov raspalis hotya oni eshyo sushestvovali kak odinochnye kletki Nekotorye iz nih zhili v koloniyah i postepenno nachalo proishodit razdelenie truda naprimer periferijnye kletki nachali vypolnyat roli otlichnye ot teh kotorye vypolnyali vnutrennie kletki Hotya raznica mezhdu koloniej so specializirovannymi kletkami i mnogokletochnym organizmom ne vsegda yasna okolo 1 mlrd let nazad poyavilis pervye mnogokletochnye rasteniya veroyatno zelyonye vodorosli Vozmozhno okolo 900 mln let nazad 488 poyavilis pervye mnogokletochnye zhivotnye Snachala oni veroyatno napominali sovremennyh gubok kotorye imeyut totipotentnye kletki kotorye pozvolyayut pri razrushenii organizma sobrat sebya 483 487 Kogda razdelenie truda vo vseh liniyah mnogokletochnyh organizmov bylo zaversheno kletki stali bolee specializirovannymi i bolee zavisimymi drug ot druga izolirovannaya kletka pogibaet Superkontinenty v proterozoe Rekonstrukciya Pannotii 550 mln let nazad Posle togo kak primerno v 1960 godu byla sozdana teoriya tektoniki plit geologi nachali rekonstruirovat dvizheniya i polozheniya kontinentov v proshlom Eto okazalos dovolno legko sdelat do perioda 250 millionov let nazad kogda vse kontinenty byli obedineny v superkontinent Pangeya Pri rekonstrukcii bolee rannih epoh net vozmozhnosti rasschityvat na ochevidnoe shodstvo beregovyh linij ili vozrast okeanicheskoj kory no tolko na geologicheskie nablyudeniya i paleomagnitnye dannye 95 Na protyazhenii vsej istorii Zemli byli periody kogda kontinentalnye massy sobiralis vmeste chtoby sformirovat superkontinent Posle chego superkontinent raspadalsya i novye kontinenty rashodilis Eto povtorenie tektonicheskih sobytij nazyvaetsya ciklom Uilsona Chem dalshe nazad vo vremeni tem trudnee interpretirovat poluchennye dannye Po krajnej mere yasno chto primerno 1000 830 mln let nazad bolshinstvo kontinentalnyh mass byli obedineny v superkontinent Rodiniya Rodiniya ne pervyj superkontinent On sformirovalsya 1 0 mlrd let nazad za schyot akkrecii i stolknoveniya oskolkov ot raspada bolee starogo superkontinenta kotoryj nazyvaetsya Nuna ili Kolumbiya i kotoryj sformirovalsya 2 0 1 8 mlrd let nazad Eto oznachaet chto process tektoniki plit analogichnyj segodnyashnemu veroyatno byl aktiven i v proterozoe Posle raspada Rodiniya okolo 800 mln let nazad vozmozhno materiki vnov obedinilis okolo 550 mln let nazad Gipoteticheskij superkontinent inogda nazyvayut Pannotiya ili Vendiya Dokazatelstvom etogo yavlyaetsya faza stolknoveniya kontinentov izvestnaya kak pan afrikanskoe goroobrazovanie kotoraya obedinila kontinentalnye massy sovremennyh Afriki Yuzhnoj Ameriki Antarktidy i Avstralii Vesma veroyatno odnako chto agregaciya kontinentalnyh mass ne byla zavershena tak kak kontinent nazyvaemyj Lavrentiya grubo govorya sovremennaya Severnaya Amerika uzhe nachal raspadatsya okolo 610 mln let nazad Po krajnej mere est uverennost chto k koncu proterozoya osnovnye kontinentalnye massy byli raspolozheny vokrug yuzhnogo polyusa Klimat i zhizn pozdnego proterozoya Iskopaemye ostanki Spriggina floundensi ediakarskogo perioda 580 mln let nazad Takie formy zhizni mogli byt predkami mnogih novyh form kotorye voznikli v period kembrijskogo vzryva V konce proterozoya bylo po krajnej mere dva perioda globalnogo oledeneniya Zemli nastolko seryoznyh chto poverhnost okeana vozmozhno byla polnostyu zamorozhena Eto proizoshlo okolo 710 i 640 mln let nazad v Kriogenie Eti surovye oledeneniya trudnee obyasnit chem Zemlyu Snezhok rannego proterozoya Bolshinstvo paleoklimatologov schitayut chto holodnye periody byli svyazany s obrazovaniem superkontinenta Rodiniya Tak kak Rodiniya byla raspolozhena na ekvatore skorost himicheskogo vyvetrivaniya uvelichivaetsya i dioksid ugleroda CO2 byl izyat iz atmosfery Iz za togo chto CO2 yavlyaetsya vazhnym parnikovym gazom klimat ohlazhdaetsya vo vsem mire Takim zhe obrazom v techenie Zemli snezhka bolshaya chast kontinentalnoj poverhnosti byla pokryta vechnoj merzlotoj kotoraya snova snizila himicheskoe vyvetrivanie chto privelo k koncu oledeneniya Alternativnaya gipoteza zaklyuchaetsya v tom chto dostatochno uglekislogo gaza bylo vybrosheno v rezultate vulkanicheskoj deyatelnosti chto privelo k parnikovomu effektu i povysheniyu globalnoj temperatury Primerno v to zhe vremya proizoshlo uvelichenie vulkanicheskoj aktivnosti v rezultate raspada Rodinii Za Kriogeniem posledoval ediakarskij period kotoryj harakterizuetsya bystrym razvitiem novyh mnogokletochnyh form zhizni Est li svyaz mezhdu koncom globalnyh lednikovyh periodov i uvelicheniem raznoobraziya zhizni ne yasno no eto sovpadenie ne kazhetsya sluchajnym Novye formy zhizni nazyvaemye ediakarskoj biotoj byli bolshe i raznoobraznee chem kogda libo Nesmotrya na to chto sistematika bolshinstva form zhizni ediakarskoj bioty neyasna nekotorye iz nih byli predkami sovremennyh vidov Vazhnym sobytiem stalo poyavlenie myshechnyh i nervnyh kletok Ni odna iz ediakarskih okamenelostej ne imela tverdyh chastej tela takih kak skelety Vpervye oni poyavilis na granice mezhdu proterozoem i fanerozoem ili ediakarskogo i kembrijskogo periodov Ediakarskaya biota Osnovnaya statya Ediakarskaya biota Ediakarskaya biota ili vendskaya biota fauna iskopaemyh organizmov naselyavshih Zemlyu v ediakarskom periode okolo 635 542 mln let nazad Vse oni obitali v more Bolshinstvo iz nih rezko otlichayutsya ot vseh drugih nyne izvestnyh zhivyh sushestv i predstavlyayut soboj zagadochnye myagkotelye v osnovnom sidyachie organizmy imeyushie trubchatuyu i obychno vetvyashuyusya strukturu Po svoej forme oni podrazdelyayutsya na radialno simmetrichnye diskoobraznye meshkoobraznye i dvustoronne simmetrichnye so sdvigom pohozhie na matrasy vetvi derevev perya Dlya podobnyh sushestv predlozhen sobiratelnyj termin Vendobionty no ih sistematicheskoe polozhenie ostayotsya neyasnym Po mneniyu mnogih paleontologov oni yavlyayutsya mnogokletochnymi zhivotnymi no otnosyashimisya k tipam polnostyu vymershim i ne ostavivshim potomkov V etom sluchae oni vhodyat v chislo drevnejshih najdennyh mnogokletochnyh sushestv sm takzhe kembrijskij vzryv S drugoj storony nekotorye iz pozdnejshih predstavitelej ediakarskoj bioty Kimberella Cloudina ne pohozhi na ostalnyh i veroyatno yavlyayutsya primitivnymi mollyuskami i polihetami Odnako stepen ih rodstva s vendobiontami neizvestna Vse predstaviteli ediakarskoj bioty vyglyadyat gorazdo bolee primitivnymi po sravneniyu s zhivotnymi sleduyushego kembrijskogo perioda no popytki najti sredi nih predkov bolshinstva tipov kembrijskih zhivotnyh chlenistonogih pozvonochnyh kishechnopolostnyh i dr do sih por ne uvenchalis uspehom Predstaviteli ediakarskoj bioty poyavilis vskore posle tayaniya obshirnyh lednikov v konce kriogeniya no stali rasprostranyonnymi lish pozzhe okolo 580 millionov let nazad Vymerli oni pochti odnovremenno s nachalom kembrijskogo vzryva zhivotnye kotorogo vidimo i vytesnili ediakarskuyu biotu Vprochem izredka iskopaemye napominayushie ediakarskie obnaruzhivayutsya eshyo vplot do serediny kembriya 510 500 mln let nazad no eto v luchshem sluchae lish reliktovye ostatki kogda to procvetavshih ekosistem FanerozojOsnovnaya statya Fanerozoj Fanerozoj yavlyaetsya osnovnym periodom sushestvovaniya zhizni na Zemle On sostoit iz tryoh epoh paleozoya mezozoya i kajnozoya Eto vremya kogda mnogokletochnye formy zhizni znachitelno diversificirovalis v pochti vse organizmy izvestnye segodnya Paleozoj Osnovnaya statya Paleozoj Paleozojskaya era chto oznachaet epoha staryh form zhizni byla pervoj i samoj dlinnoj eroj fanerozoya dlivshejsya s 542 do 251 mln let Vo vremya paleozoya poyavilis mnogie sovremennye gruppy zhivyh sushestv Zhizn kolonizirovala zemlyu snachala rasteniya zatem zhivotnye Zhizn obychno razvivalas medlenno Poroj odnako est vnezapnoe poyavlenie novyh vidov ili massovye vymiraniya Eti vspleski evolyucii chasto vyzvannye neozhidannymi izmeneniyami v okruzhayushej srede v rezultate stihijnyh bedstvij takih kak vulkanicheskaya deyatelnost udary meteoritov ili izmenenie klimata Kontinenty sformirovavshiesya posle raspada kontinentov Pannotiya i Rodiniya v konce proterozoya snova medlenno sobirayutsya vmeste v techenie paleozoya Eto v konechnom itoge privedyot k fazam goroobrazovaniya i sozdast superkontinent Pangeya v konce paleozoya Kembrijskij vzryv Osnovnaya statya Kembrijskij vzryv Trilobity poyavilis vo vremya kembrijskogo perioda i byli odnimi iz samyh rasprostranyonnyh i raznoobraznyh grupp paleozojskih organizmov V kembrijskom periode 542 488 mln let skorost evolyucii zhizni zafiksirovannaya v iskopaemyh ostankah uvelichilas Vnezapnoe poyavlenie mnozhestva novyh vidov tipov form v etot period nazyvaetsya kembrijskim vzryvom Rost biologicheskogo raznoobraziya na protyazhenii Kembrijskogo vzryva byl besprecedentnym i ne nablyudalsya ni do ni posle togo vremeni 229 Prinimaya vo vnimanie chto formy ediakarskoj zhizni byli eshyo dostatochno primitivnymi i ne tak poddayutsya sovremennoj sistematike v konce kembriya vse sovremennye tipy uzhe prisutstvovali Razvitie tverdyh chastej tela takih kak rakoviny skelety ili ekzoskelety u takih zhivotnyh kak mollyuski iglokozhie morskie lilii i chlenistonogie samoj izvestnoj gruppoj chlenistonogih iz nizhnego paleozoya yavlyayutsya trilobity sdelalo sohranenie i fossilizaciyu takih form zhizni legche chem u ih predkov v proterozoe Po etoj prichine izvestno gorazdo bolshe o zhizni posle kembriya chem o bolee staryh periodah Nekotorye iz etih kembrijskih grupp mogut pokazatsya slozhnym i sushestvenno otlichayutsya ot sovremennoj zhizni naprimer Anomalokaris i Haikouichthys V kembrii poyavilis pervye pozvonochnye zhivotnye vklyuchaya pervyh ryb 357 Sushestvo kotoroe moglo by byt predkom ryb ili veroyatno tesno svyazannym s nim byla Pikajya Ona imela primitivnuyu hordu strukturu kotoraya mogla vposledstvii stat pozvonochnikom Pervye ryby s chelyustyami Chelyustnorotye poyavilis v ordovike Kolonizaciya novyh nish privela k uvelicheniyu razmerov tel Takim obrazom v nachale paleozoya poyavilis krupnye ryby takie kak gigantskaya plakoderma Dunkleostej kotoraya mogla vyrasti do 7 metrov v dlinu Raznoobrazie form zhizni ne uvelichilos eshyo silnee iz za serii massovyh vymiranij kotorye opredelyayutsya shiroko rasprostranyonnymi biostratigraficheskimi edinicami nazyvaemye biomeres Posle kazhdogo sluchaya vymiraniya shelfovye rajony byli zaseleny pohozhimi formami zhizni kotorye vozmozhno v drugih mestah razvivalis ne tak uspeshno K koncu kembriya trilobity dostigli naibolshego raznoobraziya i dominirovali pochti vo vseh iskopaemyh kompleksah 34 Granica mezhdu kembriem i ordovikom sleduyushij period 488 444 mln let nazad ne svyazana s izvestnymi krupnymi vymiraniyami 3 Paleozojskaya tektonika paleogeografiya i klimat Pangeya superkontinent kotoryj sushestvoval primerno s 300 do 180 mln let nazad Ukazany kontury sovremennyh materikov i drugih uchastkov sushi V konce proterozoya superkontinent Pannotiya raskololsya na neskolko bolee melkih kontinentov Lavrenciya Baltika Sibir i Gondvana V period kogda kontinenty razdvigayutsya v rezultate vulkanicheskoj aktivnosti obrazuetsya bolshe okeanicheskoj kory Iz za togo chto molodaya vulkanicheskaya kora otnositelno goryachaya i menee plotnaya chem staraya okeanicheskaya kora v takie periody dno okeanov podnimetsya Eto vyzyvaet povyshenie urovnya morya Takim obrazom v pervoj polovine paleozoya bolshie ploshadi kontinentov byli nizhe urovnya morya Klimat rannego paleozoya byl teplee sovremennogo no v konce ordovika proizoshyol korotkij lednikovyj period v techenie kotorogo yuzhnyj polyus gde nahodilsya ogromnyj kontinent Gondvana byl pokryt lednikami Sledy oledeneniya v etot period mozhno najti tolko na ostatkah Gondvany Vo vremya lednikovogo perioda v pozdnem ordovike proizoshlo neskolko massovyh vymiranij v rezultate kotoryh mnogie brahiopody trilobity mshanki i korally ischezli Eti morskie vidy veroyatno ne mogli borotsya s ponizheniem temperatury morskoj vody Posle ih ischeznoveniya poyavilis bolee raznoobraznye i luchshe prisposoblennye novye vidy Oni zapolnyali nishi ostavlennye vymershimi vidami Mezhdu 450 i 400 mln let nazad vo vremya kaledonskogo goroobrazovaniya kontinenty Lavrenciya i Baltika stolknulis sformirovav Lavraziyu takzhe izvestnuyu kak Evroamerika Sledy gornyh poyasov kotorye voznikli v rezultate etogo stolknoveniya mogut byt najdeny v Skandinavii Shotlandii i na severe Appalachi V devonskij period 416 359 mln let Gondvana i Sibir nachali dvigatsya v storonu Lavrazii Stolknovenie Sibiri i Lavrazii privelo k obrazovaniyu uralskih gor stolknoveniya Gondvany s Lavraziej nazyvaetsya varisskoj ili gercinskoj skladchatostyu v Evrope i v Severnoj Amerike Poslednij etap prohodil v kamennougolnom periode 359 299 mln let i privyol k formirovaniyu poslednego superkontinenta Pangei Osvoenie sushi Devonskaya flora v predstavlenii hudozhnika Nakoplenie kisloroda v rezultate fotosinteza privelo k obrazovaniyu ozonovogo sloya kotoryj pogloshal bolshuyu chast ultrafioletovogo izlucheniya Solnca Takim obrazom u odnokletochnyh organizmov kotorye vyshli na sushu bylo menshe shansov umeret i prokarioty nachali razmnozhatsya i luchshe prisposobilis k vyzhivaniyu vne vody Prokarioty veroyatno zaselili sushu uzhe 2 6 mlrd let nazad eshyo do poyavleniya eukariot V techenie dolgogo vremeni mnogokletochnye organizmy otsutstvovali na sushe Okolo 600 mln let nazad formiruetsya superkontinent Pannotiya a zatem spustya 50 millionov let raspadaetsya Ryby samye rannie pozvonochnye poyavilis v okeanah okolo 530 mln let nazad 354 Osnovnye kembrij ordovikskie rasteniya veroyatno napominayushie vodorosli i griby nachali rasti v pribrezhnyh vodah a zatem vyshli na sushu 138 140 Samye drevnie iskopaemye ostatki gribov i rastenij na sushe datiruyutsya 480 460 mln let nazad hotya molekulyarnye dannye svidetelstvuyut o tom chto griby vozmozhno kolonizirovali sushu eshyo 1 mlrd let a rasteniya 700 mln let nazad Pervonachalno oni zhili vblizi kromki vody Zatem mutacii i izmeneniya priveli k dalnejshej kolonizacii etoj novoj okruzhayushej sredy Tochno ne izvestno kogda pervye zhivotnye pokinuli okean samye starye tochno dokazannye chlenistonogie poyavilis na sushe okolo 450 mln let nazad vozmozhno vse bolee rasprostranyayas i prisposablivayas blagodarya ogromnym istochnikam prodovolstviya predostavlennyh nazemnymi rasteniyami Sushestvuet takzhe nepodtverzhdyonnye svidetelstva togo chto chlenistonogie vozmozhno poyavilis na sushe uzhe 530 mln let nazad Evolyuciya chetveronogih Osnovnaya statya Chetveronogie Predshestvennik chetveronogih Tiktaalik ryba s plavnikami obladayushimi priznakami konechnostej Rekonstrukciya iz okamenelostej vozrastom okolo 375 mln let V konce ordovikskogo perioda 443 mln let nazad proizoshli novye sluchai vymiraniya vozmozhno svyazannye s lednikovymi periodami Okolo 380 375 mln let nazad evolyuciya ryb privela k poyavleniyu pervyh chetveronogih Predpolagaetsya chto plavniki prevratilas v konechnosti chto pozvolilo pervym chetveronogim podnyat golovu iz vody chtoby dyshat vozduhom Eto pozvolilo im zhit v bednoj kislorodom vode ili presledovat melkuyu dobychu na melkovode Pozzhe oni vozmozhno stali vybiratsya na korotkoe vremya na zemlyu V konce koncov nekotorye iz nih nastolko horosho prisposobilis k zhizni na sushe chto stali provodit svoyu vzrosluyu zhizn na zemle vozvrashayas v vodu chtoby otlozhit yajca Tak poyavilis zemnovodnye Okolo 365 mln let nazad proizoshlo eshyo odno vymiranie predpolozhitelno v rezultate globalnogo poholodaniya U rastenij poyavilis semena chto znachitelno uskorilo ih rasprostraneniya po sushe v eto vremya okolo 360 mln let nazad Primerno 20 millionov let spustya 340 mln let nazad 293 296 poyavlyayutsya amnioticheskie yajca kotorye mogut byt sneseny na sushe davaya embrionam chetveronogih bolshe shansov dlya vyzhivaniya V rezultate proizoshlo otdelenie amniot ot zemnovodnyh Eshyo 30 millionov let spustya 310 mln let nazad 254 256 proizoshlo razdelenie na sinapsid vklyuchaya mlekopitayushih i zavropsid vklyuchaya ptic i reptilij Drugie gruppy organizmov takzhe prodolzhayut razvivatsya poyavilis novye linii ryb nasekomyh bakterij i t d no ob etom imeetsya menshe dannyh Massovoe permskoe vymiranie Osnovnaya statya Massovoe permskoe vymiranie Massovoe permskoe vymiranie velichajshee massovoe vymiranie vseh vremyon odno iz pyati massovyh vymiranij sformirovalo rubezh razdelyayushij takie geologicheskie periody kak permskij i triasovyj i otdelyaet paleozoj ot mezozoya primerno 251 4 mln let nazad Yavlyaetsya odnoj iz krupnejshih katastrof biosfery v istorii Zemli privela k vymiraniyu 96 vseh morskih vidov i 70 nazemnyh vidov pozvonochnyh Katastrofa stala edinstvennym izvestnym massovym vymiraniem nasekomyh v rezultate kotorogo vymerlo okolo 57 rodov i 83 vidov vsego klassa nasekomyh Vvidu utraty takogo kolichestva i raznoobraziya biologicheskih vidov vosstanovlenie biosfery zanyalo namnogo bolee dlitelnyj period vremeni po sravneniyu s drugimi katastrofami privodyashimi k vymiraniyam Modeli po kotorym protekalo vymiranie nahodyatsya v processe obsuzhdeniya Razlichnye nauchnye shkoly predpolagayut ot odnogo do tryoh tolchkov vymiraniya Mezozoj Osnovnaya statya Mezozoj Dinozavry byli dominiruyushimi nazemnymi pozvonochnymi na protyazhenii bolshej chasti mezozoya Mezozoj srednyaya zhizn prodolzhalsya s 251 mln do 65 5 mln let On podrazdelyaetsya na triasovyj yurskij i melovoj periody Epoha nachalas s permsko triasovogo vymiraniya samogo masshtabnogo sluchaya massovogo vymiraniya v paleontologicheskoj letopisi 95 vidov na Zemle vymerli a zakonchilas tem chto proizoshlo mel paleogenovoe vymiranie unichtozhivshee dinozavrov Permsko triasovoe vymiranie vozmozhno bylo vyzvano sovokupnostyu izverzheniya sibirskih trappov stolknoveniya s asteroidom gazifikacii gidrata metana kolebaniya urovnya morya rezkogo umensheniya soderzhaniya kisloroda v okeane Zhizn sohranilas i okolo 230 mln let nazad dinozavry otdelilis ot svoih predkov Triasovo yurskoe vymiranie 200 mln let nazad oboshlo dinozavrov i vskore oni stali dominiruyushej gruppoj sredi pozvonochnyh I hotya v etot period poyavilis pervye mlekopitayushie veroyatno oni byli melkimi i primitivnymi zhivotnymi napominayushimi zemleroek 169 Primerno 180 mln let nazad Pangeya raspalas na Lavraziyu i Gondvanu Granica mezhdu ptichimi i neptichimi dinozavrami ne yasna tem ne menee arheopteriks kotoryj tradicionno schitaetsya odnoj iz pervyh ptic zhil okolo 150 mln let nazad Samye rannie svidetelstva poyavleniya cvetkovyh pokrytosemennyh rastenij otnosyatsya k melovomu periodu okolo 20 millionov let spustya 132 mln let nazad Konkurenciya s pticami privela mnogih pterozavrov k vymiraniyu i dinozavry veroyatno byli uzhe v sostoyanii upadka kogda 65 mln let nazad 10 kilometrovyj asteroid stolknulsya s Zemlyoj nedaleko ot poluostrova Yukatan gde sejchas nahoditsya krater Chiksulub V rezultate etogo stolknoveniya v atmosferu bylo vybrosheno ogromnoe kolichestvo tverdyh chastic i gazov pregradiv dostup solnechnomu svetu i prepyatstvuya fotosintezu Bolshinstvo krupnyh zhivotnyh v tom chisle dinozavry vymerli otmechaya konec melovogo perioda i mezozojskoj ery Dinozavry Osnovnaya statya Dinozavry Dinozavry nadotryad nazemnyh pozvonochnyh zhivotnyh dominirovavshih na Zemle v mezozojskuyu eru v techenie bolee 160 millionov let nachinaya s pozdnego triasovogo perioda priblizitelno 225 mln let nazad do konca melovogo perioda okolo 65 mln let nazad kogda bolshinstvo iz nih stali vymirat na styke melovogo i tretichnogo periodov vo vremya krupnomasshtabnogo ischeznoveniya zhivotnyh i mnogih raznovidnostej rastenij v otnositelno korotkij geologicheskij period istorii Iskopaemye ostatki dinozavrov obnaruzheny na vseh kontinentah planety Nyne paleontologami opisano bolee 500 razlichnyh rodov i bolee chem 1000 razlichnyh vidov kotorye chyotko delyatsya na dve gruppy pticetazovyh i yasherotazovyh dinozavrov Triasovoe vymiranie Osnovnaya statya Triasovoe vymiranie Triasovo yurskoe vymiranie otmechaet granicu mezhdu triasovym i yurskim periodami 199 6 millionov let nazad i yavlyaetsya odnim iz krupnejshih vymiranij mezozojskoj ery gluboko zatronuvshih zhizn na Zemle i v okeanah Mel paleogenovoe vymiranie Osnovnaya statya Mel paleogenovoe vymiranie Mel paleogenovoe vymiranie odno iz pyati tak nazyvaemyh velikih massovyh vymiranij na granice melovogo i paleogenovogo perioda okolo 65 millionov let nazad Ne sushestvuet edinoj tochki zreniya bylo li eto vymiranie postepennym ili vnezapnym chto yavlyaetsya v nastoyashee vremya predmetom issledovanij Chastyu etogo massovogo vymiraniya yavilos vymiranie dinozavrov Vmeste s dinozavrami vymerli morskie reptilii mozazavry i pleziozavry i letayushie yashery mnogie mollyuski v tom chisle ammonity belemnity i mnozhestvo melkih vodoroslej Vsego pogiblo 16 semejstv morskih zhivotnyh 47 rodov morskih zhivotnyh i 18 semejstv suhoputnyh pozvonochnyh Odnako bolshaya chast rastenij i zhivotnyh perezhila etot period Naprimer ne vymerli suhoputnye presmykayushiesya takie kak zmei cherepahi yashericy i vodnye presmykayushiesya takie kak krokodily Vyzhili blizhajshie rodstvenniki ammonitov nautilusy a takzhe pticy mlekopitayushie korally i nazemnye rasteniya Predpolozhitelno nekotorye dinozavry triceratopsy teropody i dr sushestvovali na zapade Severnoj Ameriki i v Indii eshyo neskolko millionov let v nachale paleogena posle ih vymiraniya v drugih mestah Kajnozoj Osnovnaya statya Kajnozoj Kajnozojskaya era nachalas v 65 6 mln let nazad i podrazdelyaetsya na paleogen neogen i chetvertichnyj period Mlekopitayushie i pticy smogli vyzhit vo vremya mel paleogenovogo vymiraniya kotoroe unichtozhilo dinozavrov i mnogie drugie formy zhizni i eto epoha v kotoroj oni razvilis v ih sovremennye vidy Razvitie mlekopitayushih Mlekopitayushie sushestvovali s pozdnego triasa no do mel paleogenovogo vymiraniya oni ostavalis malymi i primitivnymi V kajnozoe raznoobrazie mlekopitayushih bystro uvelichilos chtoby zapolnit nishi ostavlennye dinozavrami i drugimi vymershimi zhivotnymi Oni stali dominiruyushimi pozvonochnymi zhivotnymi poyavilis mnogie sovremennye vidy Iz za vymiraniya mnogih morskih reptilij nekotorye mlekopitayushie nachali zhit v okeanah naprimer kitoobraznye i lastonogie Drugie stali koshachimi i psovymi bystrymi i lovkimi suhoputnymi hishnikami Zasushlivyj globalnyj klimat v kajnozoe privyol k rasshireniyu pastbish i poyavleniyu kopytnyh mlekopitayushih takih kak loshadi i polorogie Drugie mlekopitayushie prisposobilis k zhizni na derevyah i stali primatami odna liniya kotoryh privedyot k sovremennym lyudyam Evolyuciya cheloveka Osnovnaya statya Antropogenez Nebolshaya afrikanskaya obezyana zhivshaya okolo 6 mln let nazad byla poslednim zhivotnym potomki kotoroj budut vklyuchat v sebya kak sovremennyh lyudej tak i ih blizhajshih rodstvennikov shimpanze 100 101 Tolko dve vetvi eyo semejnogo dreva imeyut vyzhivshih potomkov Vskore posle raskola po prichinam kotorye do sih por neyasny obezyany iz odnoj vetvi razvili sposobnost hodit na zadnih konechnostyah 95 99 Razmer mozga bystro uvelichilsya i okolo 2 mln let nazad poyavilis pervye zhivotnye otnesyonnye k rodu Homo 300 Konechno gran mezhdu razlichnymi vidami i dazhe rodami neskolko proizvolna tak kak organizmy nepreryvno izmenyayutsya na protyazhenii pokolenij Primerno v to zhe vremya drugaya vetv raskololas na predkov shimpanze i predkov bonobo pokazyvaya chto evolyuciya prodolzhaetsya odnovremenno vo vseh formah zhizni 100 101 Vozmozhnost kontrolirovat ogon veroyatno poyavilas u cheloveka pryamohodyashego ili u cheloveka rabotayushego po krajnej mere 790 tys let nazad no vozmozhno i 1 5 mln let nazad 67 Otkrytie i ispolzovaniya kontroliruemogo ognya moglo proizojti dazhe do cheloveka pryamohodyashego Vozmozhno ogon nachali ispolzovat v nachale verhnego paleolita olduvajskaya kultura gominidy Homo habilis ili dazhe avstralopiteki takie kak Paranthropus Trudnee ustanovit proishozhdenie yazyka neyasno mog li chelovek pryamohodyashij govorit ili zhe takaya vozmozhnost otsutstvovala do poyavleniya cheloveka razumnogo 67 S uvelicheniem razmera mozga deti stali rozhdatsya ranshe do togo kak ih golovy stanut slishkom bolshimi chtoby projti cherez taz V rezultate oni proyavlyayut bolshuyu plastichnost i sledovatelno obladayut povyshennoj sposobnostyu k obucheniyu i im trebuetsya bolee dlitelnyj period zavisimosti ot roditelej Socialnye navyki stali bolee slozhnymi yazyk stal bolee utonchyonnym orudiya bolee produmannymi Eto privelo k dalnejshemu sotrudnichestvu i intellektualnomu razvitiyu 7 Sovremennye lyudi Homo sapiens kak polagayut poyavilis okolo 200 tys let nazad ili ranshe v Afrike samye starye iskopaemye datiruyutsya primerno 160 tys let Pervye lyudi pokazavshie priznaki duhovnosti byli neandertalcy kak pravilo oni klassificiruetsya kak otdelnyj vid ne imeyushij vyzhivshih potomkov Oni horonili svoih umershih chasto bez priznakov pishi ili orudij 17 Odnako svidetelstva bolee slozhnyh ubezhdenij takie kak naskalnye risunki rannih kromanoncev vozmozhno imeyushie magicheskoe ili religioznoe znachenie 17 19 ne poyavyatsya ranee 32 tysyacheletiya do n e Kromanoncy takzhe ostavili kamennye figurki takie kak Venera Villendorfskaya takzhe veroyatno oznachayushie religioznye ubezhdeniya 17 19 11 000 let nazad chelovek razumnyj dostig yuzhnoj okonechnosti Yuzhnoj Ameriki poslednij iz neobitaemyh kontinentov krome Antarktidy kotoraya ostavalas neotkrytoj do 1820 goda Prodolzhaet uluchshatsya ispolzovanie instrumentov i kommunikacij mezhlichnostnye otnosheniya stali bolee slozhnymi Civilizaciya Na protyazhenii bolee chem 90 svoej istorii lyudi zhili v malenkih gruppah kak kochevye ohotniki i sobirateli 8 S uslozhneniem yazyka poyavilas vozmozhnost zapominat i peredavat informaciyu s ispolzovaniem novogo sredstva mema Stalo vozmozhno bystro obmenivatsya ideyami i peredavat ih iz pokoleniya v pokolenie Kulturnaya evolyuciya stremitelno operezhaet biologicheskuyu evolyuciyu nachinaetsya istoriya chelovechestva Mezhdu 8500 i 7000 do n e lyudi zhivshie na territorii plodorodnogo polumesyaca na Blizhnem Vostoke nachali sistematicheskoe razvedenie rastenij i zhivotnyh Vozniklo selskoe hozyajstvo Ono rasprostranilos na sosednie regiony ili samostoyatelno poyavlyalos v drugih mestah poka bolshinstvo homo sapiens ne nachali vesti osedlyj obraz zhizni v postoyannyh krestyanskih poseleniyah Ne vse obshestva otkazalis ot kochevogo obraza zhizni osobenno v otdalyonnyh rajonah zemnogo shara ispytyvavshih nedostatok kulturnyh vidov rastenij v takih kak Avstraliya Odnako v teh civilizaciyah kotorye prinyali selskoe hozyajstvo otnositelnaya stabilnost i povyshenie proizvoditelnosti produktov pitaniya pozvolili naseleniyu uvelichivatsya Selskoe hozyajstvo okazalo bolshoe vliyanie lyudi nachali vliyat na okruzhayushuyu sredu kak nikogda ranshe Uvelichenie razdeleniya truda i poyavlenie izlishkov pishi privelo k vozniknoveniyu svyashennicheskogo ili pravyashego klassa Eto privelo k vozniknoveniyu pervoj zemnoj civilizacii v Shumere na Blizhnem Vostoke mezhdu 4000 i 3000 let do n e 15 Poyavilis civilizacii v Drevnem Egipte v doline reki Ind i v Kitae S izobreteniem pisma stalo vozmozhno poyavlenie slozhnyh obshestv hranilisha rukopisej i biblioteki sluzhili dlya sohraneniya znanij i povysheniya obmena kulturnoj informacii Lyudyam bolshe ne prihoditsya tratit vse svoyo vremya dlya borby za vyzhivanie lyubopytstvo i prosveshenie vyzvalo stremleniyu k znaniyam i mudrosti Poyavilis razlichnye discipliny v tom chisle nauka v primitivnoj forme Poyavlyayutsya novye civilizacii torguyushie drug s drugom i voyuyushie za territorii i resursy Vskore obrazovalis pervye imperii Primerno v 500 godu do n e sushestvovali razvitye civilizacii na Blizhnem Vostoke v Irane Indii Kitae i Grecii poroj rasshiryayas so vremenem prihodya v upadok 3 Osnovy zapadnogo mira v znachitelnoj stepeni opredelyayutsya drevnej greko rimskoj kulturoj Rimskaya imperiya byla obrashena v hristianstvo imperatorom Konstantinom v nachale chetvyortogo veka a k koncu pyatogo ona prishla v upadok Nachinaya s sedmogo veka nachalas hristianizaciya Evropy V 1054 godu n e Velikij raskol mezhdu Rimskoj katolicheskoj i Vostochnoj pravoslavnoj cerkvyami privyol k poyavleniyu kulturnyh razlichij mezhdu Zapadnoj i Vostochnoj Evropoj V chetyrnadcatom veke nachalos Vozrozhdenie v Italii s dostizheniyami v oblasti 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