Question

give 3main functions of the skeleton

Answer 1

skeleton helps our body to do several works
skeleton helps our body to move
it provide shape to our body
if the bones are strong then obviously it will provide strength to our body

Answer 2

Three main functions of the skeletal system :

Mechanical: they shape and support your body. Muscles attach to bones and thogether they enable body movement.
Protective: bones protect internal organs e.g. the skull protects the brain and the ribcage protects the lungs and the heart. It also protects the marrow it contains.
Metabolic: bones produce blood cells from its marrow, the same marrow can store energy (lipids). Bones also store (essential) minerals such as calcium and phosphorus.