Multiple choice

Which of the following substances is the hardest in the human body?

  1. enamel

  2. bones

  3. hairs

  4. nails
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tooth enamel, composed mainly of hydroxyapatite, has a mineral content of 96% and ranks 5 on the Mohs scale, making it harder than bone (which contains more collagen and organic material), hair, and nails.

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