Question : Most fish do not sink in water because of the presence of:
Option 1: air sinuses
Option 2: buoyant scales on the body
Option 3: Swim bladder
Option 4: swimmerets
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Correct Answer: Swim bladder
Solution : Correct Answer is swim bladder
The swim bladder develops from an outpocketing of the digestive tube and is housed within the body cavity.Most bony fish have a buoyancy organ called a swim bladder, also known as an air bladder. The weight and density of the fish's body are offset by the air in the swim bladder, which is also known as the swim bladder air sac.
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