翻訳と辞書
Words near each other
・ Timeline of the development of tectonophysics (after 1952)
・ Timeline of the development of tectonophysics (before 1954)
・ Timeline of the discovery and classification of minerals
・ Timeline of the Eastern Front of World War II
・ Timeline of the economy of the Indian subcontinent
・ Timeline of the Egyptian Crisis under Mohamed Morsi
・ Timeline of the Egyptian Crisis under the Supreme Council of the Armed Forces
・ Timeline of the Egyptian Revolution of 2011
・ Timeline of the electric motor
・ Timeline of the English Civil War
・ Timeline of the English Poor Law system
・ Timeline of the English Reformation
・ Timeline of the Eurofighter Typhoon
・ Timeline of the Euromaidan
・ Timeline of the European colonization of North America
Timeline of the evolutionary history of life
・ Timeline of the far future
・ Timeline of the flag of the United States
・ Timeline of the formation of the Universe
・ Timeline of the French Revolution
・ Timeline of the Front de libération du Québec
・ Timeline of the Fukushima Daiichi nuclear disaster
・ Timeline of the future
・ Timeline of the future of the universe
・ Timeline of the Gallipoli Campaign
・ Timeline of the Gaza War (2008–09)
・ Timeline of the geologic history of the United States
・ Timeline of the Gezi Park protests
・ Timeline of the governorship of Ezenwo Nyesom Wike
・ Timeline of the Great Depression


Dictionary Lists
翻訳と辞書 辞書検索 [ 開発暫定版 ]
スポンサード リンク

Timeline of the evolutionary history of life : ウィキペディア英語版
Timeline of the evolutionary history of life



This timeline of evolution of life represents the current scientific theory outlining the major events during the development of life on planet Earth. In biology, evolution is any change across successive generations in the heritable characteristics of biological populations. Evolutionary processes give rise to diversity at every level of biological organization, from kingdoms to species, and individual organisms and molecules, such as DNA and proteins. The similarities between all present day organisms indicate the presence of a common ancestor from which all known species, living and extinct, have diverged through the process of evolution. More than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described.
While the dates given in this article are estimates based on scientific evidence, there has been controversy between more traditional views of increased biodiversity through a cone of diversity with the passing of time and the view that the basic pattern on Earth has been one of decimation and diversification and that in certain past times, such as the Cambrian explosion, there was great diversity.〔 Four diagrams of evolutionary models〕
==Extinctions==

Periodic extinctions have temporarily reduced diversity, eliminating:
* 2.4 billion years ago, many obligate anaerobes, in the Great Oxygenation Event;
* 252 million years ago, the trilobites, in the Permian–Triassic extinction event;
* 65 million years ago, the pterosaurs and nonavian dinosaurs, in the Cretaceous–Paleogene extinction event.
* Currently, the Holocene extinction is occurring.
Dates are approximate.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Timeline of the evolutionary history of life」の詳細全文を読む



スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース

Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.