Homo neanderthalensis | The Smithsonian Institution's Human Origins Program - 5 views
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Zarah V on 22 Nov 16In fact, Neanderthals and modern humans may have had little direct interaction for tens of thousands of years until during one very cold period, modern humans spread across Europe. Their presence may have prevented Neanderthals from expanding back into areas they once favored and served as a catalyst for the Neanderthal's impending extinction.