Amphibian heart is A. Four chambered B. Three chambered C. Two chamberedD. One chambered

The heart of amphibians is three-chambered.

Here’s a detailed explanation:

Amphibians, such as frogs, toads, and salamanders, have a heart that consists of three chambers: two atria and one ventricle.

The two atria are responsible for receiving blood: one atrium receives oxygenated blood from the lungs, while the other receives deoxygenated blood from the body.
The single ventricle pumps blood to both the lungs and the rest of the body. The oxygenated and deoxygenated blood mix to some extent in the ventricle, which makes the circulation less efficient compared to animals with a four-chambered heart, like mammals and birds.
Thus, the correct answer is B. Three chambered.