Allopatric Speciation Is Not Likely to Occur When

Multiple Choice

Allopatric speciation is not likely to occur when

A) there is no disruption in gene flow between two populations.
B) a geographic barrier forms between two populations.
C) several populations become isolated from one another as drying conditions cause a large body of water to become separate, smaller bodies of water.
D) separated populations adapt to different environmental conditions.