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Everyday Science Medium NTS Uploaded: 07 Aug 2026

Which gas do humans exhale during respiration?

  • A Hydrogen
  • B Oxygen
  • C Carbon dioxide
  • D Nitrogen
Correct Answer: Option C — Carbon dioxide
Explanation:
During respiration, humans exhale carbon dioxide, a waste product generated when cells break down glucose to produce energy. This exchange of oxygen intake and carbon dioxide release occurs continuously in the lungs' alveoli.
Submitted by: PaperMCQs
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