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42
M: +2.00/-0.50

Consider 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?

I.A.S (Pre) 2014 I.A.S. (Pre) 2011

[Environment & Development]
A
B
C
D

EXPLANATION

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