Biology / Bio 1655 · Atom · ~20 seconds
Adaptation Defined
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An adaptation is a heritable trait that improves an organism's survival or reproduction in its current environment, produced and maintained by natural selection.
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A snow leopard's thick fur, suited to a cold climate, is an adaptation natural selection has favored and maintained.
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An adaptation is judged against its current environment — a trait favorable now can become unfavorable if conditions change.