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The Cretaceous–Paleogene (K–Pg) extinction event, [a] also known as the Cretaceous–Tertiary (K–T) extinction, [b] was the mass extinction of three-quarters of the plant and animal species on Earth [2][3] approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs.
Raymond B. Cowles proposed that the dinosaurs went extinct when Earth's climate became so hot and dry that it affected the ability of male dinosaurs to produce sperm cells. [23] 1946. Edwin Harris Colbert and others proposed that the dinosaurs went extinct when Earth's climate became too hot and dry to support them. [23] 1949
While the dinosaurs met their end around 66 million years ago in a catastrophic way, their extinction may have been crucial to the development of the human race.
The Alvarez hypothesis posits that the mass extinction of the non-avian dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth. Prior to 2013, it was commonly cited as having happened about 65 million years ago, but Renne and colleagues (2013) gave an ...
The most famous of these mass extinction events — when an asteroid slammed into Earth 66 million years ago, dooming the dinosaurs and many other species — is also the most recent. But ...
This was in the aftermath of Earth's worst mass extinction 252 million years ago at the end of the Permian Period. About 95% of species were lost amid severe climate change apparently caused by ...
Nuclear war is an often-predicted cause of the extinction of humankind. [1]Human extinction 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.
For example, it is thought that ammonites were the principal food of mosasaurs, a group of giant marine reptiles that became extinct at the boundary. Omnivores, insectivores and carrion-eaters survived the extinction event, due to the increased availability of their food sources. Mammals and birds that survived the extinction fed on insects ...