Explanation:
C
Air bladder is found only in bony fishes. It is a sac-like outgrowth form the dorsal wall of the oesophagus. It is hydrostatic in function and in some cases help in respiration as well it provides bounce to the fishes and helps them in swimming.
- The actinopterygians, or Ray-finned fish, are one of the 2 major classes of bony fish (osteichthyes), the other being the lobe-finned fish, or sarcopterygians.