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greatdying2 ASIF Middle Class

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June 14, 2014, 07:43:42 AM
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January 21, 2018, 09:24:28 AM
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December 15, 2017, 06:06:21 AM
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The Permian–Triassic extinction event, a.k.a. the Great Dying, occurred about 250 million years ago and is the most severe known extinction event. Up to 96% of all marine species and 70% of terrestrial vertebrate species became extinct; it is also the only known mass extinction of insects.