 
			 
			MCQOPTIONS
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				| 1. | Which of the following is necessary for the clotting of blood, functions of certain enzymes and control of fluids through cell membranes? | 
| A. | Calcium | 
| B. | Magnesium | 
| C. | Copper | 
| D. | Cobalt | 
| Answer» B. Magnesium | |