First slide
Classification of Animals
Question

Which of following fishes has an air bladder?

Easy
Solution

An air bladder, which regulates buoyancy, is found in bony fishes (e.g., Exocoetus). 

Scoliodon, Pristis and Trygon are cartilaginous fishes. They lack an air bladder due which they have to swim constantly to avoid sinking.

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