Question

Long answer type questions
List three important distinguishing features of arthropods, reptiles and mammals

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.