Glossary Definition
In evolution, lack of fit between an organism's traits and its environment. A mismatch is likely to occur if a species that evolved in one environment moves to a different environment or if a species' environment changes rapidly and the species does not experience natural selection and adapt to these changes. Evolutionary mismatches are frequently used to explain aspects of human biology that are problematic in modern life, but that may have been beneficial over the course of our evolutionary history.

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