Diffusion - Collisions between molecules that cause them to spread apart from each other., Osmosis - Diffusion of water into or out of a cell membrane., Semi-permeable membrane. - A selective barrier that allows some molecules to move in or out of the cell., Indicator solution - Tells us when a substance is present by changing color., Cytoplasm - Water, salts and proteins inside a cell membrane., Cell membrane - The semipermeable membrane surrounding the cytoplasm of a cell., Cell wall - Surrounds the cell membrane in plants.,

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