दूध का सफेद रंग मुख्य रूप से किस प्रोटीन की उपस्थिति के कारण होता है?

What is the fundamental biological importance of phosphorus for all living organisms?

Consider the following statements regarding human nutrition: (J) Riboflavin (Vitamin B2) is fat-soluble. (K) Zinc is a trace element. (L) Calcium is categorized as a major mineral. (M) Vitamin A is necessary for vision. Choose the correct option: