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a muscle, gland or organ capable of responding to a nerve impulse in order to bring about a reaction to stimuli.
middle body tissue layer that forms the muscular, circulatory and excretory systems.
coiled nephron tubule that extends from the loop of Henlé to the collecting duct.
a species that has been introduced into an area in which it did not previously or naturally...
a microscopic hair-like extension of the cell membrane of the epithelial cells forming the outer...
small units of DNA that contain hereditary information that is passed from one generation to the...