Jellyfish are simple sea animals that have lived in the oceans for more than five hundred million years. They ha no br, no bl, and n bones, a their bod are mos made o water. Mo jellyfish mo by opening and closing their bell-shaped bodies, which pushes water behind them. They catch small fish and plankton with long tentacles that are covered in stinging cells. Some species are harmless to people, but the stings of others can be extremely painful.

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