Transcription: Diffusion, or passive transport, is the movement of molecules from an area of high concentration to an area of low concentration. The concentration gradient decreases until the molecules are evenly distributed. This movement of substances plays a vital role in the survival of living organisms. It allows nutrients to flow into cells and harmful substances to be removed. For example, glucose molecules are more numerous on the outside of this cell. They therefore flow into the cell and are broken down to provide energy. As a result, waste products reach a higher concentration inside the cell than ...
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