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21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya
a
body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears
b
body covered with moist skin which is devoid of scales, the ear is represented by a tympanun, alimentary canal, uninary and reproductive tracts open into a common cloaca.
c
fresh water animals with bony endoskeleton, air bladder to regulate buoyancy
d
marine animals with cartilaginous endoskeleton, body covered with placoid scales
answer is D.
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