__________ is essential for the formation of hemoglobin.
Correct answer: B. Iron
- A. Calcium
- B. Iron
- C. Water
- D. Carbohydrates
Explanation
Iron is essential because it forms the haem group of haemoglobin, which binds oxygen reversibly in red blood cells. Students may choose calcium because it is important for bones and muscles, but it is not the mineral incorporated into haemoglobin.
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