How did the formation of the Isthmus of Panama influence the speciation of shrimp?
A) The isthmus presented a geographic barrier to gene flow, reproductively isolating the shrimp.
B) The isthmus allowed the shrimp to evolve in allopatry.
C) The isthmus united two reproductively isolated populations of shrimp.
D) a and b
E) a and c
Correct Answer:
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