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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.
Crossing over in meiosis results in genetic recombination, which is responsible for the genetic diversity of a population. Genetic recombination and natural selection are the driving forces behind evolution. It causes most of the differences between parents and their offspring and differences between siblings.