Question

Parapatric speciation occurs when
a. selection causes a single species to develop different adaptations to a similar environment.
b. a population is divided into two reproductively isolated subgroups that form separate species.
c. a single species experiences a gradient of environmental differences within its geographic range, which result in reproductive isolation.
d. a formerly isolated subpopulation recolonizes its home range and mates with the remaining individuals.

Answer

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