Read the following information and answer the given questions.
Thousands of years ago only one species of squirrels was there and were evolved
from common ancestor.
At present there are two species of squirrels, though they have similarities among
them, cannot perform reproduction between them.
a) Analyze the factor responsible for this change.
b) How can this kind of changes be considered as beneficial for species?
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a. by natural selection or genetic drift
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