Narrow hybrid zones may persist for long times because
A) hybrids are always at a disadvantage.
B) hybrids have an advantage only in narrow zones.
C) hybrid individuals never move far from their birthplaces.
D) individuals that move into the zone have not previously encountered individuals of the other species, so reinforcement of reproductive barriers has not occurred.
E) Narrow hybrid zones are artifacts because biologists generally restrict their studies to contact zones between species.
Correct Answer:
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