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 ?
Options
(a)1 and 4 only
(b)2 and 3 only
(c)2, 3 and 4 only
(d)1, 2, 3 and 4
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