Question

3. Give three important distingusing characters of Arthopods Reptiles and Maminals?
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Answer 1

Arthropods Reptiles Mammals It has a hard exoskeleton which protects the body. The exoskeleton is made up of chitin. The outer layer epidermis of the mammals are made up of hair. The outer layer epidermis of the reptiles are made up of scales. 

It has jointed legs that allow more mobility on the land.

  Mammals have a 4-chambered heart. Reptiles have a 3-chambered heart. They respire through body surface, trachea and gills. Mammals gives birth to their young ones.  Reptiles are egg - laying creatures mostly, except some of the organisms which also gives birth to young ones.