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The answer is that species is a fuzzy concept defined a long time ago: https://www.nhm.ac.uk/discover/are-neanderthals-same-species-as-us.html https://www.nhm.a

• daveslash 5y ago
  Stack Exchange Biology is another good Q&A resource that has an answer. https://biology.stackexchange.com/questions/39664/how-could-humans-have-interbred-with-neanderthals-if-were-a-different-species https://biology.stackexchange.com/questions/39664/how-could-...