Which one of the following statements is correct?
- A$Mg$ plays roles in neuromuscular function and interneuronal transmission
- BThe daily requirement of $Mg$ and $Ca$ in the human body is estimated to be $0.2-0.3 \ g$
- CAll enzymes that utilise $ATP$ in phosphate transfer require $Ca$ as the cofactor
- DThe bone in human body is an inert and unchanging substance
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