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The cell membrane is a selectively permeable barrier that regulates the movement of substances into and out of the cell. One primary mode of transport is passive diffusion, where molecules move from a region of higher concentration to lower concentration without the use of energy. Small nonpolar molecules, such as oxygen and carbon dioxide, can freely diffuse through the lipid bilayer. Facilitated diffusion is _______ ____ _____ ______ ________ ______.
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