So... I have'nt done this since November, but hope this helps.
1. A
2. A or B (most likely A)
3.B
4.B
The central nervous system is made up of the brain and spinal cord. The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.
Answer:
Electrical stimulation of the brain (ESB) is used on humans during brain surgery to map out the brain and critical structures.
^_________^ <3