The major organ of the central nervous system, the brain, contains three distinct parts that each serve to control and coordinate the activities of the body. the brain stem controls

The Answer is Vital and Involuntary Processes.

Explanation:

The brain stem controls vital and involuntary processes, like breathing, your heart beat, and digestion.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.