13.0/18=.07222222
sig figs: 0.722 mole of water
Its been a long time since ive done this stuff but this chart used to help me a lot
Answer:
The bones of the skull and spinal column
Explanation:
The central nervous system is better protected than any other system or organ in the body. Its main line of defense is the bones of the skull and spinal column, which create a hard physical barrier to injury.