A) claspers
B) placoid scales
C) cartilaginous endoskeleton
D) air bladder
Correct Answer: D
Solution :
In sharks (class-Chondrichthyes), air bladder or lung is not present. These have cartilaginous endoskeleton and poikilothermous nature. Exoskeleton with of placoid scales, of dermal of origin. Cloacal opening seen in male usually with claspers, which are used in copulation.
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