Diffusion: Movement of particles in a liquid or gas down a concentration gradient , Move from an area of high concentration to low concentration due to random movements, Small particles can diffuse through the cell membrane (e.g. gases like O2 and CO2), Facilitated Diffusion: Diffusion that takes place through carrier protein or protein channels, Protein-lined pores of the cell membrane make this possible. , Osmosis: Specialised form of diffusion that involves the movement of solvent molecules , Requires a partially permeable membrane , The solvent moving is usually water,

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