Jellyfish are marine invertebrates of the class Scyphozoa, and can in all the oceans of the world are located. The body of an adult jellyfish is composed of a bell shape producing jelly and enclosing its internal structure suspended by tentacles. Each tentacle is covered with cells called cnidocytes that can sting or kill other animals. Medusa more to ensure the use of these cells for prey or for defense. Others, like Rhizostomae is not necessary for all the tentacles. Jellyfish lack basic sensoryOrgans and the brain, but their nervous system and rhopalia so that they perceive stimuli, such as light and odor, and respond quickly. Canon ZR800 camera review
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