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'''Natural selection''' is a mechanism,

'''Natural selection''' is a principle first observed by [[Charles Darwin]] and Alfred Russel Wallace.

first proposed by [[Charles Darwin]] and Alfred Russel Wallace, by which organisms with favorable traits are more likely to survive and reproduce than those lacking those traits or possessing unfavorable traits. Over time this mechanism might allow those favorable traits which are inheritable to become more common. This selection process is in response to forces in the natural world, as opposed to [[artificial selection]], whereby selection is made by a human being, such as a farmer selecting his breeding stock or variety of [[plant]].

They noted that organisms which were better adapted to their environment tended to survive longer and reproduce more than less well-adapted organisms.  

They predicted that over time favorable traits which are inheritable would become more common.  

According to the theory of evolution, it is through a combination of natural selection and mutation that biological complexity and adaptation arise from earlier generations of life. This view is disputed by advocates of [[Intelligent Design]]. See also [[Creationism]].   

According to the [[theory of evolution]], it is through a combination of natural selection and [[mutation]] that biological complexity and adaptation arise from earlier generations of life. This view is disputed by advocates of [[Intelligent Design]]. See also [[Creationism]].   

== Variation ==

== Variation ==