1. The biological species concept holds that two species exist when two
    Ronald Hicks Ronald Hicks United States says:
    July 22, 2017 at 7:26 AM

    The biological species concept holds that two species exist when two populations cannot successfully interbreed to produce fertile offspring.  So it would appear that rather than talking about a "ghost" species, the real issue is the range of variation within the (single) human species at any given point of time.  This is something we really know little about.

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