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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.
1 Gene flow is any movement of genes from one population to another and is an important source of genetic variation. 2  Sex can introduce new gene combinations into a population. 3  This genetic shuffling is another important source of genetic variation.ithout genetic variation, some of the basic mechanisms of evolutionary change cannot operate. There are three primary sources of genetic variation, which we will learn more about: