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.
The aquatic Phylum Cnidaria includes coral, hydra, jellyfish, and anemones. Cnidarians occur in two very different body forms, the medusa form and the polyp form. The typical jellyfish is often found in its medusae form. They usually occur in bell-shaped bodies lacking a true head and organs, but they are able to swim or float freely. Cnidarians in the polyp form include coral, hydra, and anemones. Polyps are sessile creatures meaning they are permanently attached to substrate and feed only when prey flows through their tubular bodies.