Allopatric speciation is due to

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(B) Allopatric speciation occurs when biological populations of the same species become isolated from each other to an extent that prevents or interfe

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Geographical separation of populations

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(B) Allopatric speciation occurs when biological populations of the same species become isolated from each other to an extent that prevents or interferes with gene flow.This isolation is primarily caused by geographical barriers such as mountains,rivers,or deserts.Over time,these isolated populations undergo independent evolutionary changes due to different selective pressures,genetic drift,and mutations,eventually leading to the formation of new species.

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