issb general knowledge MCQ #717

Which gas is essential for respiration?

issb general knowledge MCQ #717

  1. Question 1

    Q1. Which gas is essential for respiration?

    • A) Nitrogen
    • B) Oxygen
    • C) Carbon dioxide
    • D) Helium

    Answer: Oxygen

    Explanation: Oxygen is required for human respiration. This fact often appears in ISSB academic and general knowledge sections.