Question

What is human bone made of (mostly)?​

Answer 1

Answer:

Bones are made of connective tissue reinforced with calcium and specialised bone cells. Most bones also contain bone marrow, where blood cells are made. Bones work with muscles and joints to hold our body together and support freedom of movement. This is called the musculoskeletal system.

Explanation:

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Answer 2

Bones are made up of calcium-reinforced connective tissue, collagen and specialised bone cells.

Explanation: Collagen makes up the majority of bones, and bone is a living, developing tissue. Calcium phosphate is a mineral that gives strength and hardens the structure. Collagen is a protein that provides a soft framework. Collagen and calcium work together to produce bone strong and flexible enough to endure stress.