Answer :

Bones and shells are both structural materials found in the bodies of animals, but they have distinct differences in their composition and function.

Bones are a hard, dense connective tissue that makes up the skeleton of vertebrates. They are composed primarily of collagen, a protein that provides flexibility, and calcium phosphate, a mineral that gives bones their strength and rigidity. Bones also have living cells, blood vessels and nerves that help in maintaining and remodeling the bone tissue.

Shells, on the other hand, are protective structures that are found on the outside of many invertebrates, such as mollusks and crustaceans. They are composed primarily of calcium carbonate, a mineral that gives shells their hardness and durability. Some shells also have a protein component that provides elasticity.

In summary, bones and shells are both structural materials, but they have different compositions and functions. Bones are a living tissue that provides support and protection to the internal organs of animals, while shells are protective structures that are found on the outside of many invertebrates, and are primarily composed of calcium carbonate.

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