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Selectively Permeable Membrane: A membrane that allows some,but not all substances to pass through.

Diffusion: The spreading out of molecules from a region of high concentration to a region of low concentration

Diffusion: The spreading out of molecules from a region of high concentration to a region of low concentration

Osmosis: The movement of water molecules from a region of high concentration to a region of lower concentration through a partially permeable membrane

Turgor Pressure: The pressure of the cytoplasm and vacuole against the cell wall of a plant.

Plasmolysis: The loss of water from the cytoplasm and the movement of the cell membrane away from the cell wall

Examples of Osmosis: Animal cells; same concentration means cytoplasm stays the came size Less concentrated means the solution gains water,swell and may burst. High concentration lose water,shrivel and may die.

Amoeba: Has a contractile vacuole so it survives in a less concentrated solution

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