You are presented with the question "What has a circulatory system with a two-chambered heart?" and the following answer choices: 
- salmon
 - Man
 - Toyota
 - Birds
 - koalas
 - tuna
 - sharks
 - toads

Now knowing that fish have a circulatory system with a two-chambered heart and fish, such as tuna, is a high protein food, choose the best answer.


 

      tuna   