in amphibian the heart has

in amphibians the heart is

In amphibia, the heart has

in amphibians

in amphibians

in amphibians

In amphibians the heart is

In amphibians the heart is

In Amphibia , the heart has

[A] : in amphibians heart is two chambered. [R]: The oxygenated blood is returned to the heart through sinus venosus.