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valve between the right atrium and the right ventricle.
the part of the lung where the bronchi, bloodvessels and nerves enter and leave the lungs.
the movement of molecules across a membrane against the concentration gradient, from an area of...
a naturally occurring sequence of organisms from the various trophic levels that feed on each...
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
the broad band of tissue in plant organs under the epidermis, including the parenchyma cells and...