Final answer:
Natural selection works best with a diverse population because it allows for greater adaptability and survival in changing environments. Diversifying selection can occur, leading to increased genetic variance and population diversity.
Step-by-step explanation:
Natural selection works best with a diverse population because a broad range of offspring with different abilities and evolutionary strategies can develop. This allows for greater adaptability to changing environments and increases the chances of survival for a species. For example, in a population of rabbits living in a rocky environment, gray and Himalayan rabbits that can blend with the surroundings are better able to avoid predators than white rabbits. As a result, diversifying selection occurs, leading to increased genetic variance and population diversity.