The correct answer is Amphibians have a two-chambered heart.
Characteristics of amphibians:
1. Amphibians have a three-chambered heart - two atria and one ventricle.
2. Amphibians undergo the transformation of the larva to a miniature adult replicate, and usually from an aquatic to a terrestrial or semi-terrestrial lifestyle.
3. Most amphibians lay their eggs in water and have aquatic larvae that undergo metamorphosis to become terrestrial adults.
4. Most amphibians breathe through their lungs and their skin.