MCQOPTIONS
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				| 1. | 
                                    */*_An open system is one in which? | 
                            
| A. | Mass does not cross boundaries of the system, though energy may do so | 
| B. | Neither mass nor energy crosses the boundaries of the system | 
| C. | Both energy and mass cross the boundaries of the system | 
| D. | Mass crosses the boundary but not the energy | 
| Answer» D. Mass crosses the boundary but not the energy | |