The main constituent of hemoglobin is___________?

AChlorine

BIron

CCalcium

DNone of these

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Correct Answer: B: Iron

Explanation: The correct answer is B: Iron. The main constituent of hemoglobin is Iron. Each hemoglobin molecule contains four iron atoms (in heme groups) that bind to oxygen molecules, giving blood its red color.

The main constituent of hemoglobin is___________?

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