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| Q. |
The chemical substance present in bones and teeth is - |
| A. | Calcium phosphate |
| B. | Calcium chloride |
| C. | Calcium sulphate |
| D. | Calcium borate |
| Answer» A. Calcium phosphate | |
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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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