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The hard outer part of bones

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The outer surface of bone is called the periosteum (say: pare-ee-OSS-tee-um). It's a thin, dense membrane that contains nerves and blood vessels that nourish the bone. The next layer is made up of compact bone. This part is smooth and very hard.
User James Radford
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Answer:

The hard outer part of bones is called the periosteum.

Step-by-step explanation:

User Trgoofi
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