Biology

The correct answer is: C.Natural selection is always at play.

Explanation:

The Hardy-Weinberg equilibrium assumes that no evolutionary forces are acting on a population, including natural selection. In nature, however, natural selection is almost always at play in some form, favoring certain traits that enhance survival and reproduction. This results in changes to allele frequencies over time, making it highly unlikely for a population to remain in Hardy-Weinberg equilibrium under natural conditions.

The other options are incorrect because:

A.Populations are always small: While small populations can experience genetic drift, Hardy-Weinberg equilibrium can appl...