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?

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Q:7

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?

1 and 4 only

2 and 3 only

2, 3 and 4 only

1, 2, 3 and 4

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