The chatcteristics of class Reptilia are:

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A. Body covered with dry and cornified skin,scales over the body are epidermal, they do not hve external ears
B. Body covered with moist skin which is devoid of scales, the ear is represented by a typanum alimentary canal, urinary 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 endoske -leton, body covered with placoid scales