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the muscular tube of the mammalian digestive tract that links the mouth to the stomach.
a gland which secretes substances, usually enzymes, through a duct directly to the part of the...
competition between organisms of different species.
the inner region of the kidney, striped in appearance, made up of renal pyramids.
breaking down of large nutrient molecules using chemical means (e.g. through the action of...
consists of the pectoral and pelvic girdles together with the arms and legs.