Question: Which of the following statements are true in the context of respiration in whales and dolphins ?<br> (A) They cannot use dissolved Oxygen.<br> (B) They have gills.<br> (C) They have large nostrils.<br> (D) They often come up to the water surface to breathe.

  Option 1: (A), (B), (D)
  Option 2: (A), (B), (C)
  Option 3: (A), (C), (D)
  Option 4: (B), (C), (D)
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