1Easyprelims2 marks
Biogeochemical Cycles & Earth Systems
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 ?
A1 and 4 only
B2 and 3 only
C2, 3 and 4 only
D1, 2, 3 and 4