First slide
Classification of Animals
Question

A fisherman caught an organism in the sea. It looked strange to him because it was without scales. The organism might be 

Easy
Solution

Petromyzon is a cyclostome which is without jaws, has a circular mouth and is devoid of scales.

Ichthyosaurus is an extinct sail back reptile without scales.

Latimeria (a coelacanth) is a lobefin fish with cosmoid scales.

Torpedo is an electric ray with placoid scales.

 

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