Diffusion, Movement of molecules down a concentration gradient, Molecules move from a higher concentration to a lower concentration, How oxygen moves from lungs into the blood, Osmosis, Movement of water molecules down a concentration gradient, Water molecules move from a higher water concentration to a lower water concentration, How water enters and leaves a cell, Active Transport, Movement of molecules against a concentration gradient, Molecules move from a lower concentration to a higher concentration, Requires energy (ATP), How minerals enter a plant root hair cell from the soil

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