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

1. 

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
[A]. I and II are correct
[B]. II and III are correct
[C]. III and IV are correct
[D]. I, II, III and IV are correct

Answer: Option A

Explanation:

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