| A | B |
|---|
| cell | basic unit of structure and function in all living things |
| cell membrane | thin covering that holds parts of a cell together |
| nucleus | organelle that controls the cell's activities |
| cytoplasm | jellylike substance in a cell |
| osmosis | a type of diffusion |
| tissue | cells that work together to perform a function |
| organ | tissues that work together |
| system | organs that work together to perform a function |
| epithelial tissue | an animal's skin is an example |
| digestive system | system that breaks down food |
| nervous system | carries signals to the brain |
| capillaries | tiny blood vessels |
| bone marrow | soft center of bone which makes red and white blood cells |
| joints | places where bones attach to each other |
