In biology, evolution is the change in the characteristics of a species over several generations. The theory of evolution was developed by the naturalist Charles Darwin. Evolution relies on the process of natural selection, another thing discovered by Darwin. The theory of evolution is based on the idea that all species are related and gradually change over time. Desirable traits are the traits that help an organism survive. The organisms that have traits that help them live are able to pass those on to their offspring, who then pass those traits on to their offspring. The story of the peppered moths is a prime example of natural selection at work. The story of the peppered moth occurs in 1700-era England during the Industrial revolution.
