Most fishes do not sink in water because of the presences of:

Most fishes do not sink in water because of the presences of:
I. swim bladder
II. air bladder
III. air sacs
IV. air in spongy bones
A. II and III are correct
B. I and II are correct
C. I, II, III and IV are correct
D. III and IV are correct

Correct Option: Answer is B
I and II are correct.
Swim bladder: This is the primary organ responsible for buoyancy regulation in most bony fish. It’s a gas-filled sac located in the abdominal cavity, and by adjusting the gas volume, the fish can control its buoyancy and depth.
Air bladder: This term is synonymous with swim bladder. While some sources differentiate between a “swim bladder” for regulating buoyancy and an “air bladder” for gas exchange, in most cases, they refer to the same structure

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