Question

i protect the brain i consist of bones which are fused firmly together who I am​

Answer 1

cranium / skull bones....................

Answer 2

Answer:

The Brain is probably the most sensitive part of the human body and needs most protection. It is hence indeed the most protected organ of the whole body.

There are many layers of protection. The first layer of protection is the skull or the cranium, which is fused firmly together and protects the brain. The skull or cranium acts as armour which shields the brain from blows.