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Typical jellies have a bowl-like bell with a mouth at the center, surrounded by stem-like tentacles. The jelly swims by contracting the muscle fibers at the rim of its bell. It feeds on fish or marine invertebrates.
Most jellies live in the ocean. Their life cycle alternates between a brief attached polyp phase and a free-swimming medusa stage. Some may travel in groups of thousands. While many jellies are harmless to humans, some pack a painful sting that can cause minor or serious injuries, and, in rare cases, even death. | |
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