What are the no of chambers of heart found in all vertebrates

All vertebrates possess a muscular chambered heart.

- Fishes have a 2-chambered heart with an atrium and a ventricle.

- Amphibians and the reptiles (except crocodiles) have a 3-chambered heart with two

atria and a single ventricle.

- Crocodiles, birds and mammals possess a 4-chambered heart with two atria and two

ventricles.