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Mentioned that it's a theory
'''Natural selection''' is the mechanism by which [[allele]] frequency within a population changes over time due to [[genetic]] [[variation]] and selection pressures. Over long periods of time natural selection may lead to evolution under the [[Darwin-Wallace theory of evolution]]
'''Natural selection''' is a theory for the mechanism by which [[allele]] frequency within a population changes over time due to [[genetic]] [[variation]] and selection pressures. Over long periods of time natural selection may lead to evolution under the [[Darwin-Wallace theory of evolution]]
== Variation ==
== Variation ==