Two species that are closely related become increasingly different through

divergent evolution

Explanation:

Two species that are closely related become increasingly different through divergent evolution.

Divergent evolution is a process through which organisms of the same species diverge to become different species primarily as a result of experiencing different abiotic factors.

The experience of different abiotic factors leads to different selection pressure acting on the 2 populations. This leads to accumulation of phenotypic differences between the two populations and eventually to speciation.

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