Aonsider the following :1. Photosynthesis 2. Respiration 3. Decay of o – McqOptions

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1.	Aonsider the following :1. Photosynthesis 2. Respiration 3. Decay of organic matter 4. Volcanic action Which of the above add carbon dioxide to the carbon cycle on Earth ?
A.	1 and 4 only
B.	2 and 3 only
C.	2,3 and 4 only
D.	1,2,3 and 4
Answer» D. 1,2,3 and 4

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