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The system brings molecules to the cells. It includes blood vessels and the heart. respiratory system digestive system circulatory system nervous system
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The system brings molecules to the cells. It includes blood vessels and the heart.

respiratory system
digestive system
circulatory system
nervous system

User Thibault Clement
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i think it’s the circulatory system. it delivers oxygen and nutrients to the cells and pumps blood to the heart. hope this helps:)
User Gurgen Hakobyan
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