This Biology video tutorial discusses diffusion and osmosis. It also mentions the difference between passive and active transport. Diffusion is the movement of any material down the concentration gradient. Osmosis is the diffusion of water. Facilitated diffusion is the movement of material down the concentration gradient with the help of a carrier protein. Passive transport is the movement of material from a high concentration to a low concentration without the expenditure of energy. Active transport is the movement of material from a low concentration to a high concentration using the expenditure of ATP energy.

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