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

Explanation:

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Call me not wise unless you call all men wise. A young fruit am I, still clinging to the branch and it was only yesterday that I was a blossom. And call none among you foolish for we are neither wise nor foolish. We are green leaves upon the tree of life and surely life itself if beyond wisdom and surely beyond foolishness.
-Kahlil Gibran The Garden of The Prophet