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

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

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