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.
There are two types (or body plans) of cnidarians. There is the Medusa, which is a Jellyfish, really. And there is a Polyp, which is like an upside-down Jellyfish, if you want it simply.A polyp would be your sea anemone or coral.They spend most of their lives attached to a hard surface underwater. All Cnidarians are aquatic and carnivorous, and they occur in two basic body shapes: polyps,â¦. 2  Characteristics of Cnidaria Cnidaria is an alternative name for the invertebrate phylum Coelenterata, giving emphasis to the stinging structures as characteristic of the phylum.