Use reasoning to answer the following question. What has a relatively complex circulatory system with a three-chambered heart?
Options:
- (A) frogs
- (B) a fish
- (C) salmon
- (D) alpacas
- (E) Man
- (F) Birds
- (G) sharks
- (H) pan
Amphibians have a relatively complex circulatory system with a three-chambered heart. All frogs are amphibians. Frogs have a relatively complex circulatory system with a three-chambered heart.
So, the answer is (A).