The action of the shifting continental plates of Earth has important effects on the course of ___ of living organisms by reproductively isolating populations or allowing previously separated populations to interbreed ...

The action of the shifting continental plates of Earth has important effects on the course of speciation of living organisms by reproductively isolating populations or allowing previously separated populations to interbreed ...

Explanation:

The formation of geological barriers such as mountains special cause of allopatric type, these barriers cause isolation which prevents two or more groups from mating each other regularly and finally there is speciation. On the other hand the movement of continental masses for example can cause the union of islands that allows a new genetic crossing between populations.