A) Body covered with dry and comified skin, scales over the body are epidermal, they do not have external ears.
B) Body is covered with moist skin and is devoid of scales, the ear is represented by a tympanum, alimentary canal,
C) urinary and reproductive tracts, open into a common cloaca. Fresh water animals with bony endoskeleton and air-bladder regulate buoyancy.
D) Marine animals with cartilaginous endoskeleton and body is covered with placoid scales.
Correct Answer: A
Solution :
[a] Characteristics given in options [b], [c] and [d], belong to the classes amphibia, osteichthyes and chondrichthyes respectively.
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