EasyNEET TEST
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An aquatic vertebrate has to swim constantly to avoid sinking. This organism belongs to the class:
A
Osteichthyes
B
Cyclostomata
C
Chondrichthyes
D
Amphibia
Explanation
The feature described—absence of an air bladder (necessitating constant swimming)—are characteristic hallmarks of cartilaginous fishes belonging to Class Chondrichthyes.
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