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.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.