Vhy did the color of the peppered moth change? A. The moths' life cycle changed,
B. The environment changed
C. The amount of variation in the moth population changed
D. The number of individual moths in the population changed,

the environment changed

Explanation:

The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth population as a consequence of air pollution during the Industrial Revolution. ... Later, when pollution was reduced, the light-coloured form again predominated.

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hope that !         : )