For the formation of haemoglobin in red blood cells, which of the following substances is necessary?

Explanation

Iron is an essential component of the heme portion of haemoglobin. Each haemoglobin molecule contains iron-containing heme groups that reversibly bind oxygen, allowing red blood cells to transport oxygen from the lungs to body tissues. Iron deficiency can therefore reduce haemoglobin production and lead to iron-deficiency anaemia.