Biology

The correct answer is: C.It maintains genetic variation by keeping allele frequencies stable.

Explanation:

In the absence of migration, allele frequencies in a population are more likely to remain stable over time, as no new alleles are introduced from outside populations. This stability helps maintain the genetic variation that exists within the population, as there is no influx of different alleles that might alter the genetic composition.

The other options are incorrect because:

A.It increases genetic variation by introducing new alleles: This is the opposite of what happens in the absence of migration. Migration is what introduces new alleles from other populati...