- Jan 10, 2010
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Something like 99% of species that have ever existed are extinct. It's not entirely surprising that the other human species - of which there were never many - have gone. It's not exactly unusual; come to think of it, it's true of rather a lot of animals.
That's a difficult number to conclude given that we only know about 25% of our current number of species. Your pretty playing world expert about what nobody knows.
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