Give the difference between an open and closed system of circulation

Open circulatory system: Open circulatory system is a system where the blood flows through cavities and not blood vessels. This type of blood flow is generally found in invertebrates (except earthworms)

Closed circulatory system : This circulatory system is marked by the presence of blood vessels which conducts the flow of blood throughout the body. It is found in vertebrates and earthworms, which is an invertebrate that also possesses a closed circulatory system.

Final Answer: Hence, the basic difference is in the way the blood flows through the organism's body as explained above.