Final answer:
Oxygen is the essential gas taken in by the lungs for the body to use, while carbon dioxide is produced as a waste product and exhaled.
Explanation:
Oxygen is the gas that the lungs take from the air for the body to use. It is essential for cellular respiration and provides the necessary oxygen for cells to produce ATP. On the other hand, carbon dioxide is released as a waste product during cellular respiration and is exhaled out of the body.
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