The [[theory of natural selection]] is one of two major evolutionary theories advanced by Darwin, the other being the [[theory of descent with modification]].<ref>http://www.newworldencyclopedia.org/entry/Darwinism</ref> | The [[theory of natural selection]] is one of two major evolutionary theories advanced by Darwin, the other being the [[theory of descent with modification]].<ref>http://www.newworldencyclopedia.org/entry/Darwinism</ref> |