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organism that thrives in a relatively acid environment acidophil , acidophile
stimulation of activity in an organism or chemical activation
organism (especially a bacterium) that requires air or free oxygen for life aerobe
flat wing-shaped process or winglike part of an organism ala
study of the relative growth of a part of an organism in relation to the growth of the whole allometry
microscopic organism amoeba , animalcule
(genetics) an organism or cell having a diploid set of chromosomes from each parent amphidiploid
organism (especially a bacterium) that does not require air or free oxygen to live anaerobe
evolution of one type of organism from another by a long series of gradual changes anamorphism , anamorphosis
severe and rapid and sometimes fatal hypersensitivity reaction to a substance (especially a vaccine or penicillin or shellfish or insect venom) to which the organism has become sensitized by previous exposure anaphylactic shock
living organism characterized by voluntary movement animal , animate being , beast , brute , creature , fauna
microscopic organism such as an amoeba or paramecium animalcule , animalculum
hypothetical organism formerly thought to be intermediate between apes and human beings ape-man , missing link
natural prolongation or projection from a part of an organism either animal or plant appendage , outgrowth , process
protective covering, structure of organism armature , integument
organism that has the characteristics of a more primitive type of that organism atavist , throwback
antibody acting against tissues of the organism that produces it autoantibody
(physiology) processes that maintain a generally constant physiological state in a cell or organism autoregulation
spontaneous removal or casting off of a body part (as the tail of a lizard or claw or a lobster) especially when the organism is injured or under attack autotomy
any negative stimulus to which an organism will learn to make a response that avoids it aversive stimulus
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