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What role does respiration play in the cycling of carbon?
1. it releases carbon dioxide gas that was once part of living cells into the atmosphere
2. it takes in carbon dioxide from the atmosphere and uses it to build sugars
3. it removes carbon dioxide from the atmosphere and fixes it into organic compounds
4. it releases as much carbon dioxide as it takes in so it has no overall role in the cycle
Photosynthesis by land plants, bacteria, and algae converts carbon dioxide or bicarbonate into organic molecules. Organic molecules made by photosynthesizers are passed through food chains, and cellular respiration converts the organic carbon back into carbon dioxide gas.
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