issb general knowledge MCQ #316

Gas essential for respiration?

issb general knowledge MCQ #316

  1. Question 1

    Q1. Gas essential for respiration?

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

    Answer: Oxygen

    Explanation: Humans breathe in oxygen for cellular respiration. This fact often appears in ISSB academic and general knowledge sections.