Final answer:
The subject is Biology and the question relates to the changes in a moth population in a simulation of natural selection. The correct answer is option b: 16 white moths (bb). This change represents directional selection.
Step-by-step explanation:
The subject of this question is Biology and it is relevant to the topic of evolution and natural selection. The question refers to a simulation of natural selection in a moth population, specifically the changes in the number of dark and light-colored moths.
The correct answer is option b: 16 white moths (bb).
In this simulation, an increase in the number of dark moths and a decrease in the number of light moths indicate a shift in the population towards the darker form. This change is an example of directional selection, where one phenotype is favored over the other due to a change in the environment.