There are three types of amphibian: Anura, Caudata/Urodela, and Gymnophiona/Apoda. These are more commonly referred to as frogs/toads, salamanders/newts, and caecilians.
Description and Special Features
Amphibians are cold-blooded, therefore, they do not have vertebrae. They do not generate body heat. They're habitat includes rivers, jungles, forests, ponds, and even underground.
They need water to survive and cannot live without moisture. The top layer of skin is very thin and can absorb water through it.
They are separate from other creatures because they can produce proteins. fight bacteria, and transport water, oxygen, and carbon dioxide through out themselves.