Peppered moths, Biston betularia, are commonly found across the majority of the United Kingdom. They have both a pale and a dark form. In the early 1800s, the lighter moths blended better into their surroundings, while the darker moths stood out on the light-colored trees and were more quickly eaten. The light colored moths were therefore very common and the dark colored moths were rare. After rapid industrialization, however, when coal-burning factory pollution and soot began darkening the trees, the dark moths blended better into their surroundings, while the lighter moths stood out. What do you think happened to the population of peppered moths over time?