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Bones, some important bones in our body, 1. What is a bone?, 2. What are…

- - - - skeleton works with muscles
        
        helps us move
- - - - has all the nerves and blood vessels
    - - really hard and smooth
    - - spongy, but still pretty hard
    - - marrow
        
        makes blood cells
        
        very important!
- - - - protects the brain
- - - - protects the hearts and the lungs
- - - - protects the spinal cord