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process whereby excess amino acids are broken down in the liver to form urea.
secretory tissue in the leaves of plants that secretes water through pores in the epidermis or...
the structural and functional unit of the kidney, which filters the blood and produces urine....
the most common and most movable type of joint in the body of a mammal e.g. the elbow.
the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as...