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Suppose males and females
really represent two
different humroid species
that were combined back
in antiquity.
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On their own they were not
likely to raise. One was
aggressive and physically
strong. The other was
intelligent and nurturing.
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The male side of one species
was eliminated and the female
of the other. Modifications
for interbreeding were made.
Absolute synchronization is still
an elusive goal.
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