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The characteristics of class - Reptilia are

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body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears

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.

fresh water animals with bony endoskeleton, air bladder to regulate buoyancy

marine animals with cartilaginous endoskeleton, body covered with placoid scales

answer is D.

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Reptiles body covered with dry skin. All animals are terrestrial with body endoskeleton.

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