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Structural Organisation in Animals
Digestion and Absorption
Breathing and Exchange of Gases
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  1. The characteristics of class Reptilia are:
    1. Body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears
    2. Body covered with moist skin which is devoid of scales, the ear is represented by a tympanum, alimentary canal, urinary and reproductive tracts open into a common cloaca
    3. Fresh water animals with bony endoskeleton, air-bladder to regulate buoyancy
    4. Marine animals with cartilaginous endoskeleton, body covered with placoid scales
Correct Option: A

In option (a), all the characteristics belong to class Reptilia. In options (b), (c) and (d) the characteristics belong to the classes Amphibia, Osteichthyes and Chondrichthyes respectively.


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