Question

The hard outer part of bones

Answer 1

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.

Answer 2

The hard outer part of bones is called the periosteum.

Step-by-step explanation: