Answer:
The dark moths in the dark forests have an advantage over the light-colored moths because they are better able to camouflage themselves against the dark background of the forest. This makes it more difficult for predators, such as birds, to spot and hunt them. Additionally, the darker coloration of the moths may help them to absorb and retain more heat, allowing them to be more active in the cooler, shaded areas of the forest.
The reason for this advantage is a process called natural selection. The dark moths are less visible to predators, so they are more likely to survive and reproduce. Over time, the population of moths in the forest becomes increasingly dark-colored. This is known as industrial melanism, which is the phenomenon of dark coloration in animals in response to pollution. With the rise of industrialization, the once-light colored moths with pale backgrounds were more visible to predators, and the dark colored moths with dark backgrounds had a better survival rate and thus passed on their dark genes to the next generation.