Discussion
Most fish do not sink in water because of the presence of
- a swim bladder
- an air bladder
- air sacs
- air in spongy bones
Answer: A
Statements 1 and 2 are correct: fish stay buoyant because of the swim bladder, also called the air bladder.
It is a gas-filled sac whose volume the fish adjusts to match its density to the surrounding water, so it can hold depth without swimming. Sharks have none and must keep moving to avoid sinking.
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