A) It is caused by the decay of organic substances.
B) It is an important process in the nitrogen cycle.
C) It is carried out by green plants and certain bacteria.
D) It is an essential process in living organisms to provide energy and in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
Correct Answer: D
Solution :
The given process is an essential process in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
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