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1 January, 03:59

For natural selection to occur, variation must exist. this is true because without variation

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  1. 1 January, 06:48
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    Without variation, there is no difference between members of a population to be "selected for" in the first place. This is a basic tenet of natural selection. A new trait must arise in order to advance or decrease the fitness of the individual, and hence, its ability to pass on its genes.
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