| A | B |
|---|
| cell | basic unit of stucture and function of all living things |
| cell membrane | thin covering that encloses a cell and holds its parts together |
| nucleus | organelle that controls all of a cell's activities |
| cytoplasm | jellylike substance containing many chemicals that keep a cell functioning |
| diffusion | process by which many materials move in and out of cells |
| osmosis | diffusion of water and dissolved materials through cell membranes |
| tissue | cells that work together to perform a specific function |
| organ | tissues that work together to perform a specific function |
| system | organs that work together to perform a specific function |
