-The Barrier Between the Squirrel Populations _____________

-The barrier between the squirrel populations _____________

A) will produce distinct species as soon as the barrier becomes impassible
B) should not greatly interfere with both populations accessing both mountaintops
C) is the first part of an extinction event for both populations
D) is an effective barrier to mating and gene-flow between the two populations
E) will cause completely different mutations to occur in the two populations