Question

multiple choice question keeping in mind the structure of hemoglobin, name the nutrient that is critical for hemoglobin synthesis. calcium phosphorus potassium iron

Explanation:

Hemoglobin contains heme groups, and iron is an essential part of the heme structure. Iron binds to oxygen in the lungs and releases it in the tissues, which is crucial for hemoglobin's function in oxygen - transport. Other nutrients like calcium, phosphorus, and potassium are not directly involved in hemoglobin synthesis.

Answer:

D. Iron