Evolution

Darwin used the theory of natural selection to explain the process of evolution.

Evolution is a continuing process of natural selection that leads to the gradual change of an organism over time.

It may result in the formation of a new species.

Fossils

Fossils are the remains of living organisms that have been preserved in rock for millions of years.

A fossil

They provide evidence for evolution by showing how an organism looked millions of years ago and how it has changed over time.