Multiple choice general knowledge math & puzzles

Respiration

  1. mouth

  2. circulation

  3. oxygen

  4. carbon monoxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Respiration is the biological process by which organisms exchange gases with their environment. Oxygen is the central gas involved in this process - organisms take in oxygen and release carbon dioxide. Among the options: mouth is just an entry point for air, circulation is the transport system, carbon monoxide is actually toxic to respiration, while oxygen is the essential gas that drives cellular respiration.

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