| A | B |
|---|
| spongy bone | bone that has many small spaces in it like a sponge |
| compact bone | bone that is hard and dense, but not solid |
| calcium | mineral found in dairy products that helps keep bones strong |
| marrow | soft connective tissue inside the spaces of many bones |
| osteoporosis | condition in which body's bones become weak and break |
| ligaments | connective tissue that holds bones to bones |
| skeleton | the framework that is made up of bone |
| vertebrae | small bones that make up the backbone |
| joint | place where two bones come together |
| cartilage | flexible connective tissue that covers the ends of bones |
