Mollusks have a circulatory system with one or two hearts that pump blood, and an abalone is a shellfish or mollusk. Given these facts, what has a circulatory system with one or two hearts that pump blood among the following options:
- a fish
 - sharks
 - abalone
 - elephants
 - humans
 - crocodiles
 - giraffes
 - fur seals


 

   abalone      