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What is a 'human'?
The story highlights how defining 'human' changes the number of species we talk about. If you mean our specific genus, Homo, there are 16 recognised species. But if you broaden it to all hominins, which includes all species more closely related to modern humans than to chimpanzees, the number could be as high as 30.
Stories that explain this
Up to 30 human species may have lived throughout prehistoryRelated explainers
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