cambrian explosion wikipedia - EAS
- The Cambrian explosion, Cambrian radiation, Cambrian diversification, or the Biological Big Bang refers to an interval of time approximately 538.8 million years ago in the Cambrian Period when practically all major animal phyla started appearing in the fossil record.
en.wikipedia.org/wiki/Cambrian_explosion - 大家還會問
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檢視所有 Wikipediahttps://en.wikipedia.org/wiki/Cambrian_explosionThe Cambrian explosion, Cambrian radiation, Cambrian diversification, or the Biological Big Bang refers to an interval of time approximately 538.8 million years ago in the Cambrian Period when practically all major animal phyla started appearing in the fossil record. It lasted for about 13 – 25 million years and … 查看更多內容
The seemingly rapid appearance of fossils in the "Primordial Strata" was noted by William Buckland in the 1840s, and in his 1859 book On the Origin of Species, Charles Darwin discussed the then-inexplicable lack … 查看更多內容
Phylogenetic analysis has been used to support the view that during the Cambrian explosion, metazoans (multi-celled animals) evolved 查看更多內容
Trace fossils
Trace fossils (burrows, etc.) are a reliable indicator of what life was around, and indicate a … 查看更多內容Phylum
A phylum is the highest level in the Linnaean system for classifying organisms. Phyla can be thought of as groupings of animals based on general body plan. Despite the seemingly different external appearances of … 查看更多內容The first Ediacaran and lowest Cambrian (Nemakit-Daldynian) skeletal fossils represent tubes and problematic sponge spicules. The oldest sponge spicules are monaxon … 查看更多內容
CC-BY-SA 授權下的維基百科文字寒武紀大爆發 - 維基百科，自由的百科全書
https://zh.wikipedia.org/zh-tw/寒武纪大爆发寒武紀大爆發（亦稱寒武紀生命大爆發，Cambrian Explosion），是相對短時期的演化事件，開始於距今5.41億年前的寒武紀時期，化石記錄顯示絕大多數的動物「門」都在這一時期出現了 。它持續了接下來的2千萬年 -2.5千萬年 ，它導致了大多數現代動物門的發散。 因出現大量的較高等生物以及物種多樣性，於是，這一情形被形象地稱為生命大爆發。這也是顯生宙的開始。在世界各地發現的化石群共同印證了這一生命演化史上的壯觀景象，例如在加拿大的伯吉斯頁岩，和在中國雲 …
Wikipedia · CC-BY-SA 授權下的文字- https://simple.wikipedia.org/wiki/Cambrian_explosion
The Cambrian explosion started in the Ediacaran from about 575 mya, and continued to the Burgess Shale at about 507 mya. That is about 70 million years. By the end all modern phyla …
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- https://en.wikipedia.org/wiki/Discredited_hypotheses_for_the_Cambrian_explosion
- Regulatory genes
Hox genes regulate the operation of other genes by switching them on or off in various parts of the body, for example “make an eye here” or “make a leg there”. Very similar Hox genes are found in all animals from Cnidaria (e.g. jellyfish) to humans, although mammals have four sets of Hox ge… - Developmental entrenchment
Several scientists suggest that, as organisms become more complex, changes to their basic developmental mechanisms are more likely to be disadvantageous. In this way, the basic body design becomes "stuck in a rut", because any mutation that affects such central mechanisms wil…
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- Regulatory genes
- https://en.wikipedia.org/wiki/Cambrian
- The Cambrian Period followed the Ediacaran Period and was followed by the OrdovicianPeriod. The base of the Cambrian lies atop a complex assemblage of trace fossils known as the Treptichnus pedum assemblage.The use of Treptichnus pedum, a reference ichnofossil to mark the lower boundary of the Cambrian, is problematic because very similar trac…
- https://en.wikipedia.org/wiki/Wikipedia:WikiProject_Geology/Cambrian_explosion
41 列 · The Cambrian explosion article was reviewed by the scientific journal Nature on December 14, 2005, and found to be heavily error-laden. It has since undergone substantial reworking, …
Cambrian explosion - Wikipedia
https://war.wikipedia.org/wiki/Cambrian_explosionCambrian explosion, o Cambrian radiation, amo an medyo malaksi na pagkaguwa san kadam'an san mga mayor na mga phyla sa hayop, sadton mga 542 milyones katuig an nakalabay, sigun …
The Cambrian explosion - Understanding Evolution
https://evolution.berkeley.edu/.../meet-the-cambrian-critters/the-cambrian-explosionThe Cambrian explosion From about 570 to 530 million years ago, an evolutionary burst of life forms occurred, often referred to as the “Cambrian Explosion.” This marks an important point in …
カンブリア爆発 - Wikipedia
https://ja.wikipedia.org/wiki/カンブリア爆発カンブリア爆発 （カンブリアばくはつ、 英: Cambrian explosion ）とは、 古生代 カンブリア紀 、およそ5億4200万年前から5億3000万年前の間に突如として今日見られる 動物 の「 門 …
Cambrian–Ordovician extinction event - Wikipedia
https://en.wikipedia.org/wiki/Cambrian–Ordovician_extinction_eventThe Cambrian–Ordovician extinction event occurred approximately 488 million years ago ( mya ). This early Phanerozoic Eon extinction event eliminated many brachiopods and conodonts, and …
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