Which of the following contributes/does carbon dioxide to the carbon c – McqOptions

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1.	Which of the following contributes/does carbon dioxide to the carbon cycle on planet Earth? 1. Volcanic action 2. Respiration 3. Photosynthesis 4. Decay of organic matter
A.	1 and 3
B.	only 2
C.	1,2 and 4
D.	all these
Answer» D. all these

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