Jellyfish are fascinating animals that belong to the phylum Cnidaria. They are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles. They have stinging cells on their tentacles that they use to capture prey and defend against predators. They have a complex life cycle that involves a polyp stage and a medusa stage. Jellyfish are found in all oceans and some freshwater habitats. They can be very colorful and beautiful, but also potentially dangerous to humans .
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