Plz ! when you exercise, your muscles are hard at work! to allow your muscles to do all that work, they need more nutrients and oxygen delivered to them so they will have the energy they need. which body system supply them with those necessary things? a. digestive and respiratory b. circulatory and respiratory c. circulatory and excretory d. respiratory and skeletal
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Plz ! when you exercise, your muscles are hard at work! to allow your muscles to do all that work,...
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