Mysteries of ụwa - na Cambrian oge

Dị ka ukara sayensị, ndụ sitere na mbara ala a ruo ihe atọ ijeri afọ gara aga n'ụdị dị mfe ntule - dịpụrụ adịpụ microscopic mkpara, filamentary akụkụ, * Tụkwasị na polygonal-celled algae. Nje ndị a na ike idi naanị na mmiri na na na-ekpo ọkụ climates.

Ke ofụri ofụri, na-anwụghị nnọọ ole na ole fossils si Precambrian oge. Evolution yiri stalled kemgbe inception nke ndụ na atọ ijeri afọ, na-agbanwe na-emezu naanị ẹdude umu nke algae na microscopic ntule.

Otú ọ dị, 580 nde afọ gara aga, na a mgbanwe na akụkọ ihe mere eme nke mmalite - na Cambrian oge. Ya oge bụ n'ime ndụ nke Earth bụ obere - 80 nde afọ. Ọ bụ mgbe ahụ na mberede na ọ fọrọ nke nta n'otu oge e nwere ụdị dịgasị iche iche nke invertebrate umu. More ihe - ndụ ntule na a obere oge ndị ike iji nweta a siri ike calcareous ọkpụkpụ.

Multiple ndu forms nke Cambrian bụ ụzọ nile di iche iche nke oge a ndụ, gụnyere ụmụ mmadụ. Nke a bụ a otu oge omume na nkọ di iche iche nke umu maara dị ka ndị Cambrian gbawaranụ.

Land n'oge ahụ onye zuru pustnynyu, ihe niile dị ndụ e lekwasị naanị na mmiri. Kọntinent nke uwa nwere kpamkpam dị iche iche ebe: n'ihi na ihe atụ, na saịtị nke Greenland na North America bụ Afrika Lavrentsov ndịda bụ Brazil Chile. Arabia, Africa na Madagascar bụ n'otu Afrika, emi odude ke n'ebe ugwu nke Russian Chile, iche site na Strait nke miri emi Siberia na Chinese Chile. N'ebe ndịda, e nwere otu nnukwu ihe Australian Chile, nke e mechara kụtusịa n'ime India, Australia na a ọnụ ọgụgụ nke àgwàetiti.

Na Cambrian oge pụta ụfọdụ oge a ugwu: Northern Appalachian Ugwu, na Sayan Ridge Mountains Chingiztau (Kazakhstan).

Na mmiri, ngwa ngwa blossomed ndụ: ọ biri na trilobites, radiolarians, fom, brachiopods. Pụtara archeocyathids - multicellular ụmụ anụmanụ, nke bụ a cross n'etiti ruby na fom. Ha massively kpọgidere ala nke mmiri ozu, akpụ a ụdị nke coral kpụkọtara ọnụ. Site na njedebe nke Cambrian, ha ghọrọ nwuchapu.

N'oge a, karịsịa trilobites mụbara - oge ochie ụmụ ahụhụ dị ka oge a na woodlice. Ha nwere a ewepụghị disk ekara ahu na chitinous agha, kewara 45-50 agba na a plurality nke ụkwụ.

Na-erule ọgwụgwụ nke Cambrian e mbụ armored vertebrates, azu prototypes.

Ya mere, na-enweghị ihe ọ bụla ndị mepere forms na márá adịgide adịgide ụdị bacteria na mmadụ nje na ụwa na mberede kpụrụ ọtụtụ invertebrate na vertebrate umu, prototypes nke oge a na iche-iche. The Cambrian oge a cryptic evolutionary-awụlikwa elu na akụkọ nke ụwa.

N'ọnọdụ ka ukwuu na-eme nnyocha sịrị na a revolutionary omume oké egwu ìgwè oxygen na ikuku na oké osimiri, nakwa dị ka na-amụba flushing salts nke Sushi ma na-amụba kasịnụ nke calcium na magnesium na mmiri. The chemical mejupụtara nke mmiri agbanweela nke ukwuu nke na ntule bi n'ebe ahụ, nwetara a ọtụtụ ohere maka mgbanwe na guzobe umu.

Ọbụna-egosi na mgbe ihe a, Earth mere ka a na mberede kuu fọrọ nke nta 90 degrees, nke mere na e nwere a dị ịrịba ama mgbanwe nke niile na-enye, tectonic agbanwerịta ibe na guzobe nke oge a na enyemaka nke ụwa elu. Ọ na-enwe mmetụta e guzobere ọhụrụ umu na adaptations maka nlanarị.

The oge nke Ụwa evolushọn zutere a ọtụtụ ọdachi N'ihi ya, ọ fọrọ nke nta n'otu oge na-enweghị isịneke dinosaurs okụrede 65 nde afọ gara aga. Na na Permian oge a mkpirikpi n'otu oge ọ ghọrọ nwuchapu fọrọ nke nta 95% nke mmiri - ọ bụ 245 nde afọ gara aga.

Ma n'etiti ndia nile omimi naanị Cambrian oge iche ya ihe, kama mbibi nke umu. Emegide evolutionary obibia na-ahụ puzzle nke Cambrian gbawara nkwenye nke sitere n'aka Chineke nke oge a na iche nke ndụ, gụnyere ụmụ mmadụ.