Question: Which animals have a circulatory system?
Options:
- (A) insects
- (B) mammals
- (C) fur seals
- (D) sharks
- (E) cows
- (F) squids
- (G) a fish
- (H) chickens
Let's be accurate as possible and think step-by-step.
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.
The answer: (F).