everyday science MCQ #523

Which is the hardest substance in the human body?

everyday science MCQ #523

  1. Question 1

    Q1. Which is the hardest substance in the human body?

    • A) Knee cap
    • B) Tooth enamel
    • C) Rib
    • D) Skull

    Answer: Tooth enamel

    Explanation: Tooth enamel, composed of hydroxyapatite crystals, is the hardest substance in the human body with a Mohs hardness of about 5, harder than bone or any other tissue.