jellyfish

==A sting from a jellyfish can be deadly, but some stings are harmless to people. Box jellyfish are one of the most deadly jellyfish in the world.  The box jellyfish's venom contains toxins that attack the nervous system, the heart, and skin cells.Sea wasps (   AKA Australian box jellyfish, seen in fig. 1   <span style="color: #0c0e0d; font-family: 'Lucida Console', Monaco, monospace; background-color: #ffffff;"><span style="color: #050505; font-family: Verdana, Geneva, sans-serif;">) is one of the deadliest animals on Earth. They can kill a human in five minutes. One box jellyfish has enough poison to kill sixty <span style="color: #080808; font-family: Verdana, Geneva, sans-serif;">people. Only the tentacles are poisonous.(1) Small jellyfish eat mostly a <span style="color: #38ff00; font-family: 'Lucida Console', Monaco, monospace; background-color: #ffffff;"> variety of zooplankton, aand some time other jellyfish. Large  <span style="color: #0d0c0c; font-family: Verdana, Geneva, sans-serif; background-color: #ffffff;">jellyfish eat larger animals. Sea turtles, spadefish, sunfish, and other marine animals eat the jellyfish.(2) Jellyfish are made up of nearly 95% water. Their bodies lack an outer shell and skeletal structure, making them extremely soft. This means that they are very delicate, making them easier to damage. Since they lack any structure, if they are washed onto dry land, they will collapse and die. All jellyfish are radially symetrical. They have a top and a bottom, but have no left or right. There aren't very many ways for a jelly to move in the water. Most people think that they swim. They don't. They actually propel themselves through the water. They way that they move is simply this; they bring water into their muscular bell, then squirt it out like a jet of water. They also move just by drifting with the current. Jellies have no brain, no nervous system, and no blood at all. Their bodies consist of three layers. The innermost larey, the gastrodermis, lines the gastrovascular cavity, the middle layer is consisted of mesoglea, which is a thick substance. The outer layer is the epidermis. (3) ==

[[image:http://www.dnr.sc.gov/marine/pub/seascience/images/undrview.gif width="257" height="300" caption="Fig. 3 body plan of a jellyfish"]]


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==References 1. __Jellyfish.__ Westmade.2/21/09 http://www.westmeade.net/Library/jellyfish.htm 2. __Sea Science.__2006.South Carolina Department of Natural Resources. 2/10/09 http://www.dnr.sc.gov/marine/pub/seascience/jellyfi.html#food 3. __Ten Facts About Jellyfish.__ 2009. The New York Times Company. 2/21/09 http://animals.about.com/od/cnidarians/a/tenfactsjellyfi.htm==