What is the role of the circulatory system in the generation of energy from food?
A. The circulatory system breaks down food into simpler molecules
B. The circulatory system combines digested food with energy molecules
C. The circulatory system stores food molecules and converts them into energy
D. The circulatory system supplies oxygen from the lungs to cells for combustion of food.
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Which vessels in the circulatory system are responsible for transporting materials back to the heart?
A. alveoli
B. arteries
C. capillaries
D. veins
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