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Tooth enamel, the hardest substance in the human body, is made up of

Question
Tooth enamel, the hardest substance in the human body, is made up of
Calcium carbonate
Calcium hydroxyapatite
Calcium sulphate
Calcium chloride
Answer
Calcium hydroxyapatite
Detailed Explanation
Tooth enamel is composed of calcium hydroxyapatite, a crystalline form of calcium phosphate.
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