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a substance found in certain fatty foods or manufactured in the liver. High levels of cholesterol in the blood are thought to be linked to heart disease.
a sac-like structure in plant cells that contains the cell sap. It supports the cell and helps...
tissue that makes up the majority of the plant body and performs various functions.
(also called polymers) large, more complex molecules formed when monomers join together.
the part of the lung where the bronchi, bloodvessels and nerves enter and leave the lungs.