Evolution+and+Natural+Selection

Evolution - the change in the inherited traits of a population of organisms from one generation to the next. It is an observable phenomenon, not an explanation

Natural selection is a theory derived independently by Charles Darwin and Alfred Wallace to explain the phenomenon of evolution. Other theories, such as the theory of Lamarck, have also been used to explain evolution.

Lamarckism - acquired traits are passed along. Natural selection - traits are inherited, those best suited to the environment will survive and reproduce.