Set window back color, show msg, and OK button. Questions to Consider Tern eating a fish. Inc. There is grandeur in this view of life . . . Then answer the questions below. Explain the change.
Variation is the key to natural selection.
Prior to the industrial revolution, the trees were much lighter in color due to whitish colored lichens growing on them. The English peppered, Biston betularia, occurs as both light gray and a darker gray individuals. The moths sit on tree trunks where birds might have a hard time distinguishing them from their lichen and bark-covered background. In areas where the industrial pollution killed the lichens, thereby darkening the trees, the lighter-colored moths were not as camouflaged against hungry birds. Look back in the exploration if you are not sure.