Afraction of the original green frog population survives to reproduce and generate the new population. if the survivors of the original population survived by chance, then this event is an example
a. natural selection. b.genetic drift. c.founder effect. d.industrial melanism.

A.natural selection

Explanation:

Natural selection is the capacity of an organism to adapt to its environment. To achieve this the organism must have variations in its genotype to increase its chances to survive and breed. In the case of the frogs, we observe how even when they suffered a genetic drift (change in the genetic pool) they adapted and survived, therefore A.natural selection is the correct answer.

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