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Elis [28]
3 years ago
6

Calcium and what makes bones hard

Chemistry
1 answer:
Ira Lisetskai [31]3 years ago
5 0
Bones are made up of a framework of a protein called collagen , with a mineral called calcium phosphate that makes the framework hard and strong. Bones store calcium and release some into the bloodstream when it's needed by other parts of the body.
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