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Best Answer: Evolution by natural selection requires three ingredients: 1. Variation 2. Inheritance 3. Competition If any of these three factors are absent, no evolution can occur. They work *together*. The reason that variation is important is because there is competition among members of the same species.Namely, more individuals are born than can possibly survive to reproduce.So that means that some will produce more offspring than others.he reason that variation is important is because there is competition among members of the same species. Namely, more individuals are born than can possibly survive to reproduce.
But then there is no longer any variation for further evolution. The possibility of continued evolution therefore is critically dependent on renewed variation. For a given population, there are three sources of variation: mutation, recombination, and immigration of genes.utations are the source of variation, but the process of mutation does not itself drive evolution. The rate of change in gene frequency from the mutation process is very low because spontaneous mutation rates are low (Table 24-9).