I think the answer is nervous system and muscular system work together but i could be wrong.
Answer:
An object in motion will stay in motion unless acted upon.
Explanation:
Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
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A OR B EITHER ONE I THINK:)
Try to breath. vent with your parents, friends or guardian. never let your stress change your attitude.