Mollusks have a circulatory system with one or two hearts that pump blood.
Interestingly, a squid is also a mollusk.
Squids have a circulatory system with one or two hearts that pump blood.
What has a circulatory system with one or two hearts that pump blood?
  - squids
  - fur seals
  - the Sun
  - goats
  - the ocean
  - rocks
  - sharks
  - a fish