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  1. The chemical substance present in bones and teeth is

    2. A.

     Calcium phosphate
    B.

     Calcium chloride
    C.

     Calcium sulphate
    D.

     Calcium borate

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    Answer : Option A

    Explanation :

    Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite.

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