Answers from Katherine Zeratsky, R.D., L.D. Vitamin D deficiency â when the level of vitamin D in your body is too low â can cause your bones to become thin, brittle or misshapen.
All cnidarians have radial symmetrical. There are two major body forms among the Cnidaria-the polyp and the medusa. Sea anemones and corals have the polyp form, while jellyfish are typical medusae. When you look at them, you can see that these body forms are the same except that one is upside down.
Most cnidarians are predators. You may be familiar with some cnidarians, such as sea anemones, corals, and jellyfish. All cnidarians are diploblastic, meaning they have two tissue layers: ectoderm and endoderm. Between the two tissue layers is a gel-like layer, the mesoglea. Within the body is the gastrovascular cavity which functions both in digestion (hence, gastro-) and in