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a molecule that is built up of two or more different elements that are chemically joined together in fixed proportions.
semi-liquid mass of partially digested food and gastric juices, produced in the stomach.
a sac-like structure in plant cells that contains the cell sap. It supports the cell and helps...
a mixture of enzymes and other substances secreted by the exocrine cells of the pancreas.
a small, corky pore or narrow line on the surface of the stem of a woody plant that allows the...