Jellyfish are gelatinous marine creatures that belong to the phylum Cnidaria. They are characterized by their umbrella-shaped bell and trailing tentacles. These tentacles are lined with stinging cells called nematocysts, which jellyfish use for capturing prey and defending themselves from predators.
There are many different species of jellyfish, and they vary greatly in size, shape, and color. Some species are tiny, while others can grow up to several feet in diameter. Jellyfish can be found in all of the world's oceans, from the surface waters to the deep sea.
Jellyfish play an important role in marine ecosystems as both predators and prey. They are a food source for many marine animals, including sea turtles, fish, and birds. However, some species of jellyfish can also be harmful to humans, as their stings can cause pain, itching, and even death in some cases.
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