When most people think about natural selection, they imagine individuals competing with one another: The fastest animal escapes predators, the strongest plant produces more seeds, and the most resistant bacteria better survive antibiotics. Natural selection is often described as acting primarily at the level of the individual organism, the classic "survival of the fittest." This picture is not wrong, but it is incomplete.

When most people think about natural selection, they imagine individuals competing with one another: The fastest animal escapes predators, the strongest plant produces more seeds, and the most resistant bacteria better survive antibiotics. Natural selection is often described as acting primarily at the level of the individual organism, the classic “survival of the fittest.” This picture is not wrong, but it is incomplete.

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