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the act of taking food into the body.
the effect of the relative lengths of daylight and darkness on the physiology and behaviour of...
animals that lack a cavity between the digestive tract and the outer body wall.
the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as...
the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...
coiled nephron tubule that extends from the loop of Henlé to the collecting duct.