Question

why amphibian and reptile have 3 chamberd heart​

Answer 1

Amphibians have a three-chambered heart - two atria and one ventricle. The mixing of oxygenated and deoxygenated blood is kept to a minimum due to the timing of the contractions between the atria. ... Amphibian lungs are balloon-like structures where gas exchange is limited.

Answer 2

it is so because it makes the ambhibians and reptiles suitable to live in water as well as land..

you can Google it tooo..