Which one of the following substances is the main constituent of bones? Calcium Calcium phosphate Calcium sulphate Calcium chlorine
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Staying Healthy
Calcium is a mineral that people need to build and maintain strong bones and teeth. It is also very important for other physical functions, such as muscle control and blood circulation. Calcium is not made in the body — it must be absorbed from the foods we eat.
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answer: it's a)calcium
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