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Earth & Geology
Why Earth Has Had Five Mass Extinctions — And What Triggered Each One
Fact 1 of 303%
Over 99% of all species that ever lived are now extinct.
Ammonite fossils represent extinct marine life.
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Biological history is defined by a near-total turnover of life. Most species survived for only a few million years before vanishing.
"99.9% of all species are gone forever."
This suggests that extinction is the natural rule rather than the exception.
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