It will be difficult to provide ........ efficiently to all the cells of the body without haemoglobin.
A
CO2
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B
N2
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C
O2
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D
None of the above
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Solution
The correct option is CO2 Hemoglobin is the iron-containing oxygen-transport protein in the red blood cells of all vertebrates (with the exception of the fish family Channichthyidae) as well as the tissues of some invertebrates. It does not carry CO2 or N2 to the cells. If the haemoglobin is absent, it will be difficult to provide oxygen to the body parts efficiently.