Most fishes do not sink in water because of the presences...
Most fishes do not sink in water because of the presences of:
I. swim bladder
II. air bladder
III. air sacs
IV. air in spongy bones
II and III are correct
I and II are correct
I, II, III, and IV are correct
III and IV are correct
Correct answer is B
Fishes have a swim bladder or air bladder which helps them to remain buoyant without sinking in water. They are present in the body cavity.
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