For a population to be in Hardy-Weinberg equilibrium, the population must be small.
not experience migration.
have new mutations.
have nonrandom mating.

The population must be at carrying capacity

Explanation:

Hardy-Weinberg equilibrium has a set of conditions that must be met in order for the population to have unchanging gene pool frequencies. There must be random mating, no mutation, no migration, no natural selection, and a large sample size.

It is not necessary for the population to be at carrying capacity. The population can grow or shrink while maintaining the gene pool.

have new mutation

Explanation:

i think that the best answer would be c.

tell me if im wrong : )

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."