The muscular system is an organ system consisting of skeletal, smooth and cardiac muscles. It permits movement of the body, maintains posture, and circulates blood throughout the body.
I know it can be used as a healthier replacement for flour.... but im not sure if thats what youre asking exactly
D. oxygen,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Physical activity is like walking a dog and just doing day to day things with not alot of effort.