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.
The annelids (Annelida) or true worms, is a phylum containing worms that have segmented bodies, coelomic body cavities, a central nervous system composed of cerebral ganglia from which branches extend along the lower part of the body and, typically, bristles called chaetae that project from the body wall.he annelids (Annelida) or true worms, is a phylum containing worms that have segmented bodies, coelomic body cavities, a central nervous system composed of cerebral ganglia from which branches extend along the lower part of the body and, typically, bristles called chaetae that project from the body wall.