What are you writing write full
I believe the answer should be mates...(2)
He ability of a stream to erode and transport materials is largely based on its velocity.
The answer is reproductive isolation. Reproductive isolation ensures members of different species do not produce offspring. In this case, geographical separation is ensuring that individuals from the two different populations are not able to mate with each other. Eventually, through different selective pressures, the two populations will diverge sufficiently in genotype to become distinctly different.
C. Gradual
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