new studies suggest that neanderthals denosovans and homosapiens were actually all the same species with vastly different genetic diversity due to an extinction event that isolated the early hominids.  thus each one selectively adapting traits amongst their path for the specific area of the world they inhabitated.  then when the icecaps started melting and they started converging outwards they all met in the middle east and started fucking each other in different breeding events.  it'd just explain why that area holds so many of our original creation myths.
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