Species A is divided by a newly formed river to become two populations. These populations diverge to become two different species, B and C. If the river is dammed upstream, eliminating an isolating mechanism between B and C, what will happen?
A) Species B and C will be considered subspecies.
B) Gene flow will resume.
C) Species B and C will remain genetically isolated.
D) Species will unite to form a hybrid species, D.
Answer: C
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