Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
1Volcanic action
2Respiration
3Photosynthesis
4Decay of organic matter
Select the correct answer using the code given below.

Question

Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
1. Volcanic action
2. Respiration
3. Photosynthesis
4. Decay of organic matter
Select the correct answer using the code given below.

Accepted Answer

(C) 1, 2 and 4 only

Answer

(A) 1 and 3 only

Answer

(B) 2 only

Answer

(D) 1, 2, 3 and 4