Answer:
4.) Nervous System
Explanation:
Nervous system helps in nervous coordination and it is the system that provide communication to all the parts of the body through electrical and chemical impulses.The two nervous system are;
1.)Central nervous system(CNS)
2.)peripheral nervous system(PNS).
The central nervous system control all behaviors and its is the largest part of the nervous system, with inclusion of the brain and the spinal cord.
Nervous system have communication with several other body systems
For instance, when we run the nervous system send message directly to other part of our body system such as; The circulatory system,muscular system and the skeletal system about the activities that is about to take place and that the Skeletal muscles need neural inputs to begins it's contraction.