8. Most fish do not sink in water because of the presence of: I. swim bladder II. air bladder III. air sacs IV. 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 Solution: 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.
