GROSS ANATOMY

Detailed explanation-1: -Final answer: Arthropoda and Mollusca have an open circulatory system .

Detailed explanation-2: -In contrast to a closed system, arthropods (including insects, crustaceans, and most mollusks) have an open circulatory system. In an open circulatory system, the blood is not enclosed in the blood vessels, but is pumped into a cavity called a hemocoel.

Detailed explanation-3: -The phyla in which the circulatory system is open and the body cavity is filled with blood are present in Mollusca and Arthropoda. Open circulatory systems work by pumping blood into a hemocoel. The species in the phylum Arthropoda have an open circulatory system.

Detailed explanation-4: -The open circulatory system is found in arthropods such as insects and mollusks such as snails and octopuses.

Detailed explanation-5: -As opposed to a closed system, arthropods– including insects, crustaceans, and most mollusks– have an ‘open’ circulatory system.