Answer:
The axons and the myelin sheath
Depending on the degree of injury,for the first two categories of nervous injury neuropraxia and axonotomesis, the myelin sheath and axons are usually severed not the cell body. The interest of the researchers will be to then increase growth and rate of regeneration of the axons which is usually 1mm per day
B : taking oxygen into the body
A wood fire most definitely can be put out with water
