Are Fish The Only Ones With Two Chambered Hearts?
Are Fish The Only Ones With Two Chambered Hearts? Fish have a two-chambered heart with unidirectional circulation. Amphibians have a three-chambered heart, which has some mixing of the blood, and they have double circulation. Does any animal have a 2 chambered heart? Bird and mammal hearts have four chambers (two atria and two ventricles). A