Biology

The correct answer is: A.It alters allele frequencies, making equilibrium impossible.

Explanation:

The Hardy-Weinberg principle assumes that no evolutionary forces are acting on a population, including natural selection. When selection is present, it alters allele frequencies by favoring certain alleles over others, causing them to become more or less common over time. This change in allele frequencies disrupts the equilibrium, making it impossible to maintain Hardy-Weinberg equilibrium.

The other options are incorrect because:

B.It reduces the fitness of individuals...