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
The correct answer is: B
Explanation
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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