Introduction of Bone
Bone is a hard tissue in the body or on the surface of a human or animal. It can be divided into two types. The bones of humans and higher animals are in the body, composed of many bones called endoskeles; the hard shells outside the mollusks and scales of some vertebrates (such as fish, and turtles.) are called exoskeleton. Bone is a hard organ that makes up the vertebrate...
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