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Photosynthesis converts carbon dioxide into organic carbon and respiration returns it as:

ACarbon monoxide
BCarbon disulphide
CCarbon tetrachloride
DCarbon dioxide
Answer & Solution
Correct answer: D. Carbon dioxide
1. The carbon cycle runs in both directions. 2. Respiration undoes what photosynthesis built. 3. So it returns as carbon dioxide. _Source: OpenStax Biology 2e, Chapter 46, Ecosystems._
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