could u differentiate between closed circulatory system and open circulatory system?

Answer 1

From the reference below, "In a closed system, blood is always contained within vessels (arteries, veins, capillaries, or the heart itself). In an open system, blood (usually called hemolymph) spends much of its time flowing freely within body cavities where it makes direct contact with all internal tissues and organs."
The open system is typically found in arthropods such as insects, and mollusks such as shellfish.