The different body systems include the muscular system, digestive system, and nervous system.
The muscular system is necessary for the movement of the body. It also maintains posture and circulates blood.
The digestive system includes the mouth, throat, esophagus, stomach, etc they're vital in helping the body digest food.
The nervous system controls movement and other processes such as digestion, breathing, etc. They're useful while one is walking and eating pizza.
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