What are the main characteristics of amphibians?

undergo metamorphosis., coldblooded and absorb water and undergo gas exchange

Amphibians are small vertebrates that need water, or a moist environment, to survive. The species in this group include frogs, toads, salamanders, and newts ... The larvae are aquatic and free-swimming-frogs and toads at this stage are called tadpoles. At a certain size, the young develop limbs and lungs.