3. Is a bone a living structure, or merely a deposit of mineral compounds?

A bone is a living structure

Explanation:

A bone is a rigid organ that constitute part of the vertebrates skeleton in animals.

Bones protect the various organs of the body

It produces red and white blood cells

It stores minerals

It also enables mobility

so whats the answer

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%