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How do the circulatory, respiratory, digestive, and excretory systems work together to supply nutrients to the body's cells and to remove waste products?
The ( respiratory, circulatory ) system and ( excretory, digestive ) system provide the body with oxygen and nutrients.
The ( circulatory, respiratory ) system transports oxygen and nutrients to body cells and carries away waste products.
The ( digestive, respiratory ) system expels carbon dioxide, a gaseous waste product, from the body.
The ( excretory, circulatory ) system removes other waste products from the body.