Question

b. Geographical and reproductive
isolation of organisms gradually
leads to speciation.
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Answer 1

The geographical and reproductive isolation of organisms gradually leads to speciation and their reproductive ability and period is also different because therefore the individuals from one species cannot reproduce with individuals from other species.

Answer 2

The geographical isolation is the physical separation of two populations by the geographical barriers. This occurs through adaptive radiation and allopatric speciation. The reproductive isolation is the separation of two populations of the same species, preventing interbreeding and production of a fertile offspring.