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B
Respiration
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C
Digestion
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D
Growth
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Solution
The correct option is B Respiration
Haemoglobin is the protein molecule present in red blood cells that carries oxygen from the lungs to the body's tissues and returns carbon dioxide from the tissues to the lungs. One molecule of haemoglobin binds to four molecules of oxygen. It is the respiratory pigment present in humans. It also plays an important role in maintaining the shape of the red blood cells.