(B) Hemoglobin is a protein in red blood cells that carries oxygen. The iron atom at the center of the heme group in hemoglobin must be in the ferrous

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(B) Hemoglobin is a protein in red blood cells that carries oxygen. The iron atom at the center of the heme group in hemoglobin must be in the ferrous state $(Fe^{2+})$ to bind oxygen effectively. If the iron is oxidized to the ferric state $(Fe^{3+})$,it forms methemoglobin,which is incapable of binding oxygen.