Biology

The correct answer is: D.A gradual increase in the frequency of dark-colored moths due to pollution.

Explanation:

In the case of the peppered moths, the theory of gradualism is supported by the gradual increase in the frequency of dark-colored moths over time. This shift occurred as the environment changed due to industrial pollution, which darkened the tree bark. The darker-colored moths were better camouflaged from predators, so they had a higher survival rate. Over many generations, the proportion of dark-colored moths in the population gradually increased, demonstrating small, incremental changes in response to environmental changes....