Question

Closed circulatory system occurs in which of the following organism?

• A. Snail
• B. Cockroach
• C. Cuttlefish
• D. All of the above

Answer 1

The correct option is C Cuttlefish

Insects like all arthropods (cockroach) as well as molluscs (snail) have an open circulatory system which differs in both structure and function from a closed circulatory system which is found in humans and other vertebrates.
Although cuttlefish are molluscs, they do not have a hard shell to protect them and also even though they are invertebrates, they do have closed circulatory system. Cuttlefish are a part of the cephalopod group and they have a closed circulatory system. They have three hearts that transfer blood throughout the animal. So, the correct answer is option C.