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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.
The consequence of this recombination is the production of sperm and ova that can potentially add even greater diversity to a population's gene pool. However, it does not result in new alleles. Subsequently, recombination by itself does not cause evolution to occur. Rather, it is a contributing mechanism that works with natural selection by creating combinations of genes that nature selects for or against.