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'''Natural selection''' is a principle was first proposed by [[Charles Darwin]] and Alfred Russel Wallace, who 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.  

'''Natural selection''' is a principle that was first proposed by [[Charles Darwin]] and Alfred Russel Wallace, who 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]].   

The prevailing theory in [[Biology]] is that natural selection is the mechanism by which [[allele]] frequency within a population changes over time due to [[genetic variation]] and selection pressures.

The prevailing theory in [[Biology]] is that natural selection is the mechanism by which [[allele]] frequency within a population changes over time due to [[genetic variation]] and selection pressures.

Natural selection is the mechanism in which members of a population exhibiting a specific [[phenotype]] that have a reproductive advantage over other members of the population based on the current selection pressures produce more viable offspring giving the next generation a higher percentage of the "favorable" phenotype.  

Natural selection is the mechanism in which members of a population exhibiting a specific [[phenotype]] have a reproductive advantage over other members of the population not exhibiting that phenotype.  This is based on the current selection pressures in the environment.  Due to this reproductive advantage, the group with the phenotype should produce more viable offspring that over time will increase their percentage in the overall population.  

Genetic variation thus occurs due to several factors.  

Genetic variation thus occurs due to several factors.