*An ______ containing protein-hemoglobin is present in the Red Blood Cells of blood.*
1️⃣ iron
2️⃣ calcium
3️⃣ copper
4️⃣ zinc
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An iron containing protein-hemoglobin is present in the Red Blood Cells of blood.
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An ___iron___ containing protein-hemoglobin is present in the Red Blood Cells of blood.
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