Which one of the following statements is correct?

1. A. The daily requirement of Mg and Ca in the human body is estimated to be 0.2-0.3 g
2. B. All enzymes that utilise ATP in phosphate transfer require Ca as the cofactor
3. C. The bone in human body is an inert and unchanging substance
4. D. Mg plays roles in neuromuscular function and interneuronal transmission

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