You are presented with the question "What has a three chambered heart?" and the following answer choices: 
- alpacas
 - goats
 - elms
 - bats
 - orchids
 - mammals
 - a fish
 - toads

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


 

        toads 