Question

 RBCs of the blood contain ______an iron compound *
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Answer 1

Answer:

Hemoglobin, also spelled haemoglobin, iron-containing protein in the blood of many animals—in the red blood cells (erythrocytes) of vertebrates—that transports oxygen to the tissues.

Answer 2

Answer:

answer is haemoglobin if your not sure with this answer then consult to your teacher but I'm sure answer is right