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Natural selection causes changes in populations of organisms not individual organisms because

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Natural selection causes changes in populations of organisms not individual organisms because differential reproductive success caused by genetic variation is necessary for the process of natural selection.
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User Ramin Afshar
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Natural selection affects or changes a population and not only an individual organism because as there are somethings to be changed in a certain organism to adapt to the changes in the environment, all organisms in a certain species will be able to adapt and the changes therefore is collective. 
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User Thomas Gorisse
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