 
			 
			MCQOPTIONS
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				| 1. | __________ play a key role in the transformation of rock to soil. | 
| A. | Cyanobacteia | 
| B. | Pectin decomposing bacteria | 
| C. | Nitrifying bacteria | 
| D. | De-nitrifying bacteria | 
| Answer» B. Pectin decomposing bacteria | |