Let's think step by step! Which animal has a circulatory system with a three-chambered heart?
Options:
- (A) animals
- (B) Salamander
- (C) fur seals
- (D) mammals
- (E) alpacas
- (F) a fish
- (G) warm-blooded
- (H) barnacles
The thinking starts now:
Amphibians have a relatively complex circulatory system with a three-chambered heart. Frogs, toads and salamanders are amphibians. Salamanders have a relatively complex circulatory system with a three-chambered heart. The final answer: (B).