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a substance that consists of two or more chemically joined atoms.
disease caused when the arteries that supply the heart muscle become narrowed or blocked by the...
in plants: the structure within a seed that will develop into the new plant.
the sheet-like muscle found below the ribcage that plays a vital role in breathing.
a social structure in which different classes are determined by heredity.
coiled nephron tubule that extends from the loop of Henlé to the collecting duct.