The more we discover about our species' family tree, the harder it becomes to pinpoint when exactly Homo sapiens emerged, ...

sapiens who were exposed to different selection pressures in the new realm of Eurasia. "For any case of inbreeding of a Neanderthal female with a Homo sapiens or Denisova male, there is a high ...

Such an incompatibility, they note, would have likely led to hemolytic disease in offspring if a Homo sapiens or Denisova male were to mate with a Neanderthal female—a result that would have led ...