Class Amphibia

Reproduction:
They mate annually usually in freshwater biomes. Males attract females using calls or scents. After a female accepts his call, they go into their mating stance. In their sexual embrace, the male clasps the female from behind and fertilizes the eggs as they are released by the female. Afterwards, the couple unclasps from each other after all of the newly baby frogs are fertilized. Parents usually leave the eggs after they are born, but others stay to protect them. Male poison frogs, however, guard them from predators until they hatch.

Organs:
Amphibians have a pulmonary circulation, in which the blood is pumped from the chambered heart to the lungs. Second, the blood is circulated to the body and back. Then the non-oxygenated blood is pumped to their shins (legs), which is why frogs jump long heights, or why salamanders or newts travel faster than most animals.