MCQOPTIONS
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				| 1. | 
                                    In-situ based bio remediation involves introducing __________________ to contaminated areas. | 
                            
| A. | Oxygen and nutrients | 
| B. | Carbon dioxide and methane | 
| C. | Nitrogen and CO<sub>2</sub> | 
| D. | CO and methane | 
| Answer» E. | |