n a committee set up to prepare and arrange topics to be discussed, the order of business, etc., for a legislative assembly or other body. vigilance committee. n (in the U.S.) a self-appointed body of citizens organized to maintain order, punish crime, etc., where an efficient system of courts does not exist.
Best Answer: Annelids have closed circulatory systems, which means that blood is always contained by blood vessels. Some mollusks and arthropods, on the other hand, have open circulatory systems, which means that at some time, blood from the heart will pump into the hemocoel or blood cavity.n Annelids, the blood vessels end up with capillaries. Hence called closed BVS. In cockroach it is open BVS as blood vessels don't end up with capillaries. Hence, the blood vessels bluntly open into body cavities. NOTE: Circulatory system is also called BVS.
Molluscs and annelids also share a eucoelomate body cavity; i,e,. the coelom is completely lined with mesoderm tissue. A major difference between them is that annelids are segmented and have a closed circulatory system whereas molluscs are not segmented and have an open circulatory system.Phylum: Mollusca - [soft body] snails, bivalves, squid and octopi. Molluscs are a diverse group with over 50,000 described species.hat are 2 differences between the excretory systems, the circulatory systems, the respiratory systems, and the digestive systems of these two different phylum, in specific an earthworm and a garden snail. Source(s): biology comparison phylums annelida mollusca: https://shortly.im/9p1yo. Aubree Â· 2 months ago.