Rayuwa a duniya a Cretaceous lokaci

Cretaceous lokaci ne na karshe zamanin, da karshe Mesozoic zamanin. Ya aka yi nasara da Jurassic, bisa ga lissafin geologists, kusa da wani wuri 145 da miliyan da suka wuce da kuma tsawon game da tamanin shekaru miliyan, bayan da farkon na zurfi na lokaci shi ne daban-daban, da Cenozoic, zamanin - "cikin zamanin wani sabon rai." Sunan wannan wajen dogon mataki na ci gaba da Earth samu dangane da cewa ta bar mu da gadon iko alli adibas na Marktl da yashi. Ko da yake a lokacin wadannan tamanin shekaru miliyan on Earth bai faruwa wani bala'i a kan wani planetary sikelin, sabili da haka, nau'i nau'i na babban adadin shuka da dabbobi jinsunan, duk da haka da motsi na tectonic faranti, da canji a duniya teku matakin da canjin yanayi ya sanya da gyara a cikin tsarin juyin halitta halittu masu rai .

Cretaceous a subdivided cikin sub-sassan: ƙananan kuma babba alli. Don gane da yadda rayuwa ta faro a cikin tekuna, a kan ƙasa, kuma a cikin iska na lokaci, kana bukatar ka taƙaice faye hali da nassi, tun da Jurassic mataki tectonic orogenic tafiyar matakai. A cikin ƙananan Cretaceous zamanin Gondwana da Laurasia ci gaba da motsa daga juna. Daidai wannan tsari ya faru tare da Afirka ta Kudu da kuma Amurka. Saboda haka, Atlantic Ocean an ƙara zama saba mana yanzu fayyace. Amma a cikin gabashin Gondwana shi garwaya da Laurasia. Australia ya inda shi zaune, kuma a yanzu, amma ruwa ya tashi kawai na uku na yanzu yankin.

Upper Cretaceous ne halin da cewa a arewacin yammancin duniya teku matakan fara tashi, da kuma manyan wuraren Gabashin Turai, Western Siberia, da dukan Arabiya, da kuma kusan dukkan zamani Canada sun kasance a ƙarƙashin ruwa. Duk da haka, nan da karshen na Cretaceous lokaci na Duniya fara kama da siffar zamani duniya.

A Cretaceous lokacin da aka canza da kuma sauyin yanayi. Ya, ba shakka, da yawa warmer fiye da na zamani. Space na yau Turai da aka rufe a wurare masu zafi Jungle. Duk da haka, da a babban latitudes sun alternated yanayi, da kuma hunturu snowfall. Irin sauyin yanayi ya ba Yunƙurin zuwa da cewa, tare da spore da gymnosperms bayyana zakrytosemennye shuke-shuke. Irin bishiyoyi ne Beech, Birch, ash, gyada, ya bayyana a wannan zamanin na cikin Cretaceous, tsira har yau ba tare da wani canje-canje. Land samu da farko flowering shuke-shuke - na farko Magnolia, sa'an nan ya tashi. A flowering shi yana da amfani cewa su pollen ne da za'ayi ba kawai iska, amma kuma kwari. Fruit shuke-shuke, sa da iri a cikin 'ya'yan baza via dabba ci' ya'yan. Saboda haka, 'ya'yan itace da flowering shuke-shuke flooded dukan duniya.

Canje-canje a cikin Flora a Cretaceous lokaci ya kai ga zargin sabon jinsunan fauna. A cikin iska Karfe flit farko malam da kuma yawo da kudan zuma ciyar da Nectar daga furanni. Tẽku zo mamayar foraminifera, matattu da nĩƙaƙƙun harsashi wanda ya ba da sunan duk wannan yanki lokaci. Tare da su akwai wasu mollusks, da na Ammonawa. A kifi mulkin mamaye sharks da kuma fitar kasusuwan jikinsu kifaye. A dabbobi na Mesozoic zamanin - sama da dukan, da dinosaur, kuma farkon dabbobi masu shayarwa - amince "koma" daga Jurassic da Cretaceous. Amma a kan alli da dama matattu-karshen reshe na birdlike dinosaur mutuwa fita, kamar archeopteryx. Amma akwai tsuntsu - magabatan zamani geese, plovers, ducks da loons.

A Mesozoic Era (Jurassic lokaci musamman), bisa ga sanannen fim, kuma aka sani da wannan zamanin na cikin dinosaur. A general, da mulki na zamanin d dinosaur kiyaye su a cikin alli. Amma a kan na karshe zamani, Stegosaurus vuya daga fuskar duniya, da alkuki na Tyrannosaurus. Rich Flora da gudummawar da zargin sabon iri da herbivorous dinosaur: Triceratops, Iguanodon ankylosaur da sauransu. Za mu iya cewa a cikin Cretaceous zamanin dinosaur jinsunan bambancin peaked. Kuma a wannan lokaci, ya kange daga cikin Refayawa cikin su burrows, suka rayu kuma nan gaba shugabanni na Duniya - dabbobi masu shayarwa. Wadannan dabbobi, kamar berayen da wuya isa daya mita a tsawon, mafi jinsunan sun kananan egglayers, marsupials testaceous ko kananan dabbobi, da yin la'akari har zuwa 500 g. Amma bayan su kasance a nan gaba.