Which is the hardest substance in the human body?
Correct answer: A. Tooth enamel
- A. Tooth enamel
- B. Skull
- C. Knee cap
- D. Rib
Explanation
Tooth enamel is the hardest substance in the human body because it contains a very high proportion of mineral crystals. Bone is strong but is less hard and more flexible than enamel.
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