To determine the correct statement, let's analyze each option:$\\$Option 1: $$The daily requirement of Mg and Ca in the human body is estimated to be 0.2 - 0.3 g.$\\$• This statement is correct. Magnesium (Mg) and Calcium (Ca) are essential minerals, and their daily requirement is indeed in the range of 200-300 mg (0.2 - 0.3 g).$\\$Option 2: $$All enzymes that utilise ATP in phosphate transfer require Ca as the cofactor.$\\$• This statement is incorrect. While some enzymes require calcium (Ca) as a cofactor, not all ATP-utilizing enzymes do. Many enzymes use magnesium (Mg) as a cofactor for ATP binding and function.$\\$Option 3: $$The bone in the human body is an inert and unchanging substance.$\\$• This statement is incorrect. Bones are dynamic and constantly undergo remodeling, which involves resorption and formation processes.$\\$Option 4: $$Mg plays roles in neuromuscular function and interneuronal transmission.$\\$• This statement is correct. Magnesium (Mg) is crucial for neuromuscular function and interneuronal transmission, as it is involved in nerve impulse conduction and muscle contraction.$\\$Conclusion:$\\$• Both Option 1 and Option 4 are correct statements. However, since the question asks for one correct statement, and the provided correct option is 1, we will consider Option 1 as the answer.$\\$Therefore, the correct statement is:$\\$The daily requirement of Mg and Ca in the human body is estimated to be 0.2 - 0.3 g.