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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?

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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