Adaptation is the characteristic or trait developed by an organism to assist in its survival. An adaptation can be structural (e.g. polar bears have thick fur to provide insulation against the cold), physiological (e.g. the common mole has a good sense of smell because it finds its prey underground), or behavioural (e.g. the rabbit will squeak when it is being chased to warn other rabbits that there is danger).
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a character seen in a living organism
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An adaptation is a characterstic or trait developed by an organism to assist in the adaptation can  be structural physiological .