Kettlewell's experiment is included in most biology texts as an example of evolution occuring. How do we know that the moths evolved? (peppered moths)

The environment the moths lived in used to be unpolluted. This made dark moths rare. As the area where light moths were found became more polluted, the light moths became less common in the polluted/dark areas. Light Moths began to evolve after not being able to survive in dark forests, they began to get darker and blend in with the polluted area to be safe from predators.

Explanation: