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Jellyfish are fascinating creatures that have existed for over 500 million years, making them one of the oldest living species on Earth. They possess a unique structure, lacking a brain, heart, or bones, and are primarily composed of water—about 95%. Some species can glow in the dark due to bioluminescence, and they have specialized cells called cnidocytes that contain stinging nematocysts to capture prey and defend against predators. Remarkably, certain jellyfish species, like the Turritopsis dohrnii, can revert to their juvenile form, effectively allowing them to escape death and potentially live indefinitely.

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