You are presented with the question "have a circulatory system with one or two hearts" and the following answer choices: 
- Birds
 - alpacas
 - elms
 - Clams
 - salmon
 - animals
 - toads
 - complex

Now knowing that mollusks have a circulatory system with one or two hearts that pump blood and clams, oysters and snails are familiar mollusks, choose the best answer.


 

    Clams     