Natural selection

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Morpha typica and morpha carbonaria, morphs of the peppered moth resting on the same tree. The light-colored morpha typica (below the bark's scar) is hard to see on this pollution-free tree, camouflaging it from predators such as Great Tits.

Natural selection is the gradual, non-random process by which biological traits become either more or less common in a population as a function of differential reproduction of their bearers. It is a key mechanism of evolution. The term "natural selection" was popularized by Charles Darwin who intended it to be compared with artificial selection, what we now call selective breeding.

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