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How are bones made? -Oscar, 10

https://www.youtube.com/watch?v=VFDTPk1qX28

Dear Oscar,

A couple months before you were born, your skeleton was soft and bendy. It was made out of cartilage, the same material that’s in your nose and ears now. But when certain cells in your body called osteoblasts and osteoclasts began to work together, new bone started to form.

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