Timeline of the evolutionary history of life | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-14

This is an audio version of the Wikipedia Article:
Timeline of the evolutionary history of life


00:01:30 1 Extinction
00:03:38 2 Detailed timeline
00:03:58 2.1 Hadean Eon
00:04:10 2.2 Archean Eon
00:04:22 2.3 Proterozoic Eon
00:04:41 2.4 Phanerozoic Eon
00:05:12 2.4.1 Palaeozoic Era
00:05:31 2.4.2 Mesozoic Era
00:05:48 2.4.3 Cenozoic Era
00:05:59 2.4.3.1 Historical extinctions



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SUMMARY
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This timeline of the evolutionary history 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. However, a May 2016 scientific report estimates that 1 trillion species are currently on Earth, with only one-thousandth of one percent 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 annihilation and diversification and that in certain past times, such as the Cambrian explosion, there was great diversity.