Among the following - the ones that are primarily composed of calcium carbonate - are

Options :
  1. Fish scales
  2. Shark teeth
  3. Oyster shells
  4. Whale bones

Answer and Explanation :-

Answer: Option 3


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Do not forget that the value and interest of life is not so much to do conspicuous to do ordinary things with the perception of their enormous value.
-Pierre Teilhard de Chardin