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.
Cnidarians take their name from cnidocyte cells, most of which contain a nematocyst-a stinging cell that injects a toxin. Only Cnidarians have nematocysts. All cnidarian forms are either a sedentary polyp or a floating/free-swimming medusa. They have no excretory or respiratory system.onfidence votes 9.4K. The word cnidarian is a very unique word that begins with two consonants. One of only two in the entire English language that begins with 'cn' producing the same sound as the letter 'n' alone.