haemoglobin in the blood is a complex protein rich in (1)iron(2)silve(3)copper(4)gold
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option 1 iron is your answer
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iron
Explanation:
Hemoglobin is the protein in blood that is rich in iron and gives it the red color. It makes up about 95% of a red blood cell and has an oxygen binding capacity of 1.34 mL O2/g, which satisfies the need for the average adult consumption of 250 mL of oxygen per minute.
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