Question

a student wrote an explanation to describe how and why the peppered moth population has evolved over time.
click on the sentence that most needs to be revised to improve the students explanation.
there is genetic variation in populations of peppered moths, with some having light wings and some having dark wings. after the industrial revolution, the birch trees where peppered moths live were blackened by smoke from factories. this made peppered moths with light wings easier for predators to spot and eat, while peppered moths with dark wings were better able to camouflage and avoid predators. because of this environmental change, peppered moths with light wings mutated so they could have dark wings.

Explanation:

The sentence "Because of this environmental change, peppered moths with light wings mutated so they could have dark wings" is incorrect. Mutations are random and not a direct response to environmental change. The correct idea is that in the population, there was already genetic variation (some with dark wings). When the environment changed (trees blackened), the dark - winged moths had a survival advantage (not that light - winged moths mutated in response).

Answer:

"Because of this environmental change, peppered moths with light wings mutated so they could have dark wings"