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extremely hard, calcium-rich substance which covers the crown of the tooth.
the outermost nucleated cytoplasmic layer of the Schwann cells that surrounds the axon of a...
the movement of an organism in response to a one-directional source of light when the stimulus...
reactions in which large complex molecules are broken down to form smaller,simpler molecules;...
simple inorganic chemical substances (mineral salts) that are needed in relatively large amounts...