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(By Examveda Team)

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.