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

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 Correct Answer I and II are correct

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.
Bissoy MCQ

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