Most fish do not sink in water because of the presence of
  1. swim bladder
  2. air bladder
  3. air sacs
  4. air in spongy bones
  • 1I and II are correct
  • 2II and III are correct
  • 3III and IV are correct
  • 4I, II, III and IV are correct
Answer:- 1
Explanation:-

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