Question

what is geographical isolation?
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Answer 1

Answer:

Geographical isolation is isolation of a species or a group of individuals from others by the means of some physical (geographical) barrier like river, mountain, big glacier etc. As the result of geographic isolation, the two species are reproductively isolated.

Answer 2

Explanation:

The separation of two populations of the same species or breeding group by a physical barrier, such as a mountain or body of water. Geographical isolation may ultimately lead to the populations becoming separate species by adaptive radiation. See also allopatric; speciation.