all living things are constanly faced with the situation of adjusting to their changing environment what human body system controls regulates and coordinates most of our body function with this changing environment

The Nervous system

Explanation:

The nervous system is the control center of the human body. It is made up of the brain, spinal cord, and nerves. It receives and interprets stimuli and transmits impulses to organs. Your brain uses the information it receives to coordinate all of your actions and reactions.

this would start to sound a little like mortal combat

make sure each item is its own paragraph.