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Which gas is transported by the circulatory system in humans and is used by cells during respiration to release energy stored in food?
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Which gas is transported by the circulatory system in humans and is used by cells during respiration to release energy stored in food?

User Gabriel Gartz
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Umm oxygen or co2, If I'm wrong I'm sorry
User Achiash
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Oxygen. Respiration is the process of O2 being broken down and attached to polypeptide bonds of nitrogen and phosphates. 
User Koque
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