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#56570 Bangla Language & Literature Basic Information of Daily Science Inventions and Level 0

The hardness of the bone tissue is due to the phosphates and carbonates of which of the following pairs of elements?

  1. A calcium and potassium
  2. B calsium and magnesium
  3. C calsium and sodium
  4. D magnesium and sodium
Answer: D - magnesium and sodium

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