Why are there so many species of most living beings but only species of humans?
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In the past there used to be other species that, arguably, could be called humans. Neanderthals, denisovans, closely related hominids like that. They have gone extinct, but as of yet no one is completely sure why. Some people guess that we (*Homo sapiens*) killed them all off, but there is evidence that there was a little interbreeding, so some guess that we coexisted and they all died for some other reason.
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