Mollusks have a circulatory system with one or two hearts that pump blood, and interestingly, a squid is also a mollusk. Given these facts, an animal which may have one or two hearts to pump blood is: among the following options:
- squid
 - goats
 - bats
 - mammals
 - toads
 - Birds
 - edible
 - a fish


 

 squid        