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Ramin Afshar · Answer 1 · 2018-10-18T19:00:45+0000

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.

Thomas Gorisse · Answer 2 · 2018-10-22T05:50:23+0000

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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