Mollusks have a circulatory system with one or two hearts that pump blood, and interestingly, a squid is also a mollusk. Given these facts, what has a circulatory system with one or two hearts that pump blood among the following options:
- squids
 - fur seals
 - the Sun
 - goats
 - the ocean
 - rocks
 - sharks
 - a fish


 

 squids        