Which is the best example of organisms that have been naturally selected?
a) dark-colored peppered moths on soot-covered tree bark during the industrial revolution in england
b) light-colored peppered moths on soot-covered tree bark during the industrial revolution in england
c) both light colored and dark colored peppered moths on light-colored tree bark before the industrial revolution in england
d) neither dark-colored nor light-colored peppered moths on light-colored tree bark before the industrial revolution in england