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==Key Stage 3==
===Meaning===
'''Evolution by natural selection''' is the process by which new species are formed over thousands of generations.
===About Evolution by Natural Selection===
: Evolution is caused by two important factors; [[variation]] and [[heredity]].
: A species will have [[variation]] between [[organisms]] in the [[population]]. This means they will all be slightly different.
: Some [[variation]]s are [[heredity|hereditary]] which means they are passed on from parent to [[offspring]].
: If a [[heredity|heritable]] [[variation]] gives a member of the [[species]] an advantage over the others in its environment, then it is more likely to survive and reproduce. This is natural selection where some [[variation]]s cause [[organism]]s to die while other [[variation]]s cause [[organism]]s to have more [[offspring]].
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