Multiple choice

Which gas do we breathe out more through our respiratory system?

  1. Oxygen

  2. Carbon dioxide

  3. Hydrogen

  4. Water vapours

  5. Carbon monoxide

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon dioxide is the gas that we breathe out during the respiration process. It is one of the major waste products of our body which get removed through this process.