The skeletal system, the muscle system, and the nervous systems all work together. explain one link between the skeletal system and muscular system, between the skeletal system and the nervous system, and between the muscular system and the nervous system

1.)The skeletal system is the frame work for the muscles which gives them the ability to move. 
2.) The nervous system and the skeletal system work together by sensory receptors in the joints between bones send signals to the brain about body position and how they need to move. 
3.) The muscular system and the nervous system work together by the nervous system sending impulses to the brain to tell them when to move and how to move. 

Each gram of carbohydrates and proteins yield 4 calories / gram . the more the calories a food has the more energy it provide to you body.