How many early human species existed on Earth?

Nov 12, 2020
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Question: Is there a branching chart or any source of research that shows the "best consensus so far" of how the genus Homo evolved to contain several species and sub-species and eventually evolved to contain just one species, (us)? Second question: Is there any research that can probabilistically relate the extinction of ancient Homo species to climate change and/or other natural events?
 

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