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| a plant, animal, or other organism bearing an evolutionary relationship to another, often as a member of the same family |
| any alteration in the structure of an organism resulting from natural selection, by which the organism becomes more able to survive in its environment |
teratogenesis ter·a·to·gen·e·sis (těr'ə-tə-jěn'ĭ-sĭs)
n.
Development of malformed organisms or growths. Also called teratogeny.