Final answer:
Iron is crucial for oxygen transport in the blood as it is a key component of hemoglobin, the protein responsible for carrying oxygen to cells.
Explanation:
The nutrient important for oxygen transport in the blood is iron. Iron is essential for this process because it is a component of hemoglobin, a protein in red blood cells that carries oxygen to cells. Hemoglobin consists of four globular peptides, each containing an iron-containing heme complex.
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