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Nuclear war is an often-predicted cause of the extinction of humankind. [1]Human extinction or omnicide is the hypothetical end of the human species, either by population decline due to extraneous natural causes, such as an asteroid impact or large-scale volcanism, or via anthropogenic destruction (self-extinction), for example by sub-replacement fertility.
Behavioral modernity develops by this time or earlier, according to the "great leap forward" theory. [70] Extinction of Homo floresiensis. [71] M168 mutation (carried by all non-African males). Appearance of mt-haplogroups U and K. Peopling of Europe, peopling of the North Asian Mammoth steppe. Paleolithic art.
First non-marine eukaryotes move onto land. They were photosynthetic and multicellular, indicating that plants evolved much earlier than originally thought. [53] 750 Ma Beginning of animal evolution. [54] [55] 720–630 Ma
How long can a human live? Jeanne Calment, the world’s oldest person, offers a ceiling of 122 years and 164 days. But researchers have pondered that the limit could be around 150 years, and ...
In their seminal 1967 paper in Science, Sarich and Wilson estimated the divergence time of humans and apes as four to five million years ago, [236] at a time when standard interpretations of the fossil record gave this divergence as at least 10 to as much as 30 million years.
Human history is the record of humankind from prehistory to the present. Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers.They migrated out of Africa during the Last Ice Age and had spread across Earth's continental land except Antarctica by the end of the Ice Age 12,000 years ago.
The estimated time for all nucleons in the observable universe to decay, if the hypothesized proton half-life takes its smallest possible value (8.2 × 10 33 years). [144] [note 4] 10 36 –10 38 (1–100 undecillion) Estimated time for all remaining planets and stellar-mass objects, including the Sun, to disintegrate if proton decay can occur. [9]
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