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Answer:Hemeis the prosthetic group of myoglobin and hemoglobin.Porphyrinis the organic ring constituent of heme.Fe2+is the central atom of heme under usual circumstances.The central iron atom gets displaced by 0.4 Angstrom out of the plane of the porphyrin ring system indeoxyhemoglobin.The central atom comprises ofsixbonds, that is,fourto nitrogen atoms,oneto oxygen, andoneto a histidine residue in the porphyrin ring....