MCQOPTIONS
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				| 1. | 
                                    Arrange the constituent gases of the atmosphere in descending order of their percentage to the total composition of the atmosphere. | 
                            
| A. | 1-2-4-3 | 
| B. | 1-4-2-3 | 
| C. | 1-2-3-4 | 
| D. | 1-4-3-2 | 
| Answer» B. 1-4-2-3 | |