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3.2 vocab.
| Term | Definition |
|---|---|
| selectively permeable | A property of cell membranes that allows some substances to pass through while others cannot. |
| diffusion | The process by which molecules move from an area of higher concentration to an area of lower concentration. |
| osmosis | The diffusion of water molecules through a selectively permeable membrane. |
| passive transport | The movement of materials through a cell membrane without using the cell's energy. |
| active transport | The movement of materials through a cell membrane using energy. |