Final answer:
Natural selection in evolution involves differential survival and reproduction, influenced by genetic variation, reproductive success, and overproduction of offspring.
Explanation:
Natural selection is a key mechanism in evolution where organisms better adapted to their environment tend to survive and reproduce more, leading to the increase of particular favorable traits in a population. Among the options given, gene flow is NOT a requirement of natural selection; it does not directly influence differential reproductive success or overproduction of offspring. Genetic variation, differential reproductive success, and overproduction of offspring are essential components driving natural selection by impacting which traits are passed on to future generations.
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