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1 vote
The majority of carbon dioxide returns to the lungs

as part of
hemoglobin.
plasma.
oxygen.
bicarbonate ions.

2 Answers

3 votes
oxygen, it couldn't be plasma or hemoglobin or bicarbonate ions.
User Kammi
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3 votes
Carbon dioxide returns to the lungs as part of Bicarbonate ions. It is transported as part of the bicarbonate system.
User Mera
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