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![]() Date: 2005-04-22 19:03:00Astronomy Extinction events Climate history Impact events Biology Permian–Triassic extinction event David M. Raup Background extinction rate Jack Sepkoski Planetary science Geologic time scale Phanerozoic | Source URL: www.pnas.orgDownload Document from Source WebsiteFile Size: 1,07 MBShare Document on Facebook |
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