Multiple choice

The major constituent of vertebrate bone is

  1. calcium phosphate

  2. calcium carbonate

  3. sodium chloride

  4. potassium hydroxide
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A Correct answer
Explanation

Vertebrate bones are primarily composed of calcium phosphate in the form of hydroxyapatite crystals, which provides hardness and rigidity. Calcium carbonate is the main component of invertebrate shells like those of mollusks. Sodium chloride and potassium hydroxide are not structural components of bone tissue.

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