A major mineral used principally to form bones and teeth and to ensure proper nerve conduction, blood clotting and muscle contractions is known as:
  1. Calcium
  2. Magnesium
  3. Chlorine
  4. Fluoride
Explanation
ANSWER: A - Calcium is a major mineral which aids in the formation of bones and teeth, helps to ensure proper nerve conduction, aids in blood clotting and muscle contractions. Significant sources of calcium include dairy products, sardines, beans, cauliflower and citrus fruits.
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