Linear density. Linear density is the measure of a quantity of any characteristic value per unit of length. Linear mass density (titer in textile engineering, the amount of mass per unit length) and linear charge density (the amount of electric charge per unit length) are two common examples used in science and engineering.
Gastrovascular system of the flatworm Dugesia, colored yellow. The gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Cnidaria (including jellyfish and corals) and Platyhelminthes (flatworms). The cavity may be extensively branched into a system of canals.In cnidarians, the gastrovascular system is also known as the coelenteron, and is commonly known as a blind gut or blind sac, since food enters and waste exits through the same orifice.astrovascular system of the flatworm Dugesia, colored yellow. The gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Cnidaria (including jellyfish and corals) and Platyhelminthes (flatworms). The cavity may be extensively branched into a system of canals.
This term is now often applied to both the Cnidaria and the Ctenophora together, based on the fact that species belonging to these two phyla have radial or biradial symmetry. Some of the other common characteristics of the Cnidaria phylum include: 1.All species belonging to this phylum have bodies that have radial symmetry. This means that they are the same shape from every side and that the whole jellyfish body is around a central axis. 2.ne of the more interesting characteristics of the species of this phylum is the fact that they exist in two different body forms. They are a polyp or a medusa at different times in their life cycle. The reproductive cycle of the members of this phylum is also distinctive.