diffusion - The process by which molecules collide and spread apart from each other from an area of higher concentration to lower concentration, until there is equal concentration., osmosis - The diffusion of water across a membrane., indicator solution - This solution changes color if there is a positive reaction., semi-permeable membrane - Allows some molecules to pass through., cell wall - This surrounds the cell membrane in plants only.., cell membrane - The semipermeable membrane surrounding the cytoplasm of a cell., cytoplasm - semi-fluid substance of the cell.,

Diffusion Through a Membrane

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