| A | B |
|---|
| cells | The "building blocks" that make up all living things |
| tissues | A collection of cells that work together. It is made up of similar cells |
| organ | Two or more different types of tissues working together as a single structure |
| organ system | Two or more organs working together to make our bodies function properly |
| nutrient | Carbohydrates, fats, proteins, vitamins, minerals, and water |
| oxygen | gas needed for living cells |
| matrix | The hard nonliving part of bone |
| compact bone | The hard dense part of bone. |
| spongy bone | The lighter part of bones that contains many small hoes or spaces |
| bone marrow | The soft jelly-like material that fills the spaces in spongy bone and the large space in the middle part of long bones. Blood cells form in it. |
| red marrow | One of the marrows in bones that produce red blood cells |
| yellow marrow | One of the marrows in the bones that stores fat, to be used as energy |
| calcium | A mineral needed for developing strong bones and teeth,and healthy heart, muscles, and nerves |
