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Which of the following adds/ add carbon dioxide to the carbon cycle on the planet Earth?

I. Respiration
II. Volcanic action
III. Photosynthesis
IV. Decay of organic matter

Select of the correct answer using the code given below.

A I and II only
B II only
C I, II and IV only
D I, II, III and IV
Answer & Explanation
Option: [C]

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