A) photosynthesis
B) chemosynthesis
C) decomposition of organic compounds
D)
evolution of 
Correct Answer: C
Solution :
In carbon cycle, the bacteria function as decomposers. They decompose the dead and decaying animals and plant pan into simple, organic and inorganic compounds for further use by plants and other animals. The parts of organic carbon becomes incorporated into the earths crust as coal, pertroleum, gas, limestone and coral reef. Use of these deposits as fossil fuel, releases the carbon compounds into the atmosphere.
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