Osmosis: causes cell to shrink, semi permeable membrane required, sweating causes cells to lose water, movement of water from a high water concentration to a low, causes cell to burst, Diffusion: oxygen from the lungs to the blood, no energy needed, carbon dioxide from the blood to the lungs, glucose into a cell, movement of substances from a high to a low concentration, active transport: requires energy, glucose into the blood, substances moving from a low concentration to a high, against concentration gradient, molecule carried across membrane,

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