You are presented with the question "What has a relatively complex circulatory system with a three-chambered heart?" and the following answer choices: 
- frogs
 - a fish
 - salmon
 - alpacas
 - Man
 - Birds
 - sharks
 - pan

Now knowing that amphibians have a relatively complex circulatory system with a three-chambered heart and all frogs are amphibians, choose the best answer.


 

 frogs        