Natural selection is a mechanism of evolution in which certain individuals from a population exhibit enhanced reproductive success based on inherited characteristics.
Evolution is the gradual change in the inherited traits of biological populations over many generations. These traits are the expressions of genes that are passed down through reproduction from parent to offspring. Because of mutation, genetic recombination, and other causes of genetic variation, different traits frequently occur within a population.
This variety is subjected to evolutionary processes like natural selection (including sexual selection) and genetic drift, which cause some traits to become more or less prevalent within a population. This is when evolution happens. Heritable traits evolve over successive generations as a result of shifting evolutionary forces that determine whether a trait will be frequent or rare within a population.
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