Any of the essential chemical elements like calcium, iron, or nitrogen can fill the blank because they are all vital mineral nutrients for human health or plant growth. Minerals are essential inorganic nutrients that the body or plants need for normal functioning, growth, and development.
_______is an important mineral nutrient.
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Question context
This question is part of 🧬 Biochemistry within the broader 🧬 Medical Science subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.