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Jellyfish are often called "immortal" because some species, particularly Turritopsis dohrnii, have the unique ability to revert to an earlier stage of their life cycle instead of dying. This process, known as transdifferentiation, allows the jellyfish to transform its adult medusa form back into a polyp, essentially restarting its life.

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1. When a Turritopsis dohrnii jellyfish experiences stress, injury, starvation, or aging, it can trigger this transformation.

2. Its cells reprogram themselves, turning into different types of cells (a process called transdifferentiation).

3. The adult jellyfish collapses and forms a cyst-like structure, which then develops into a polyp.

4. The polyp can later grow into a new medusa, essentially making it as if the jellyfish was reborn.

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☆Unlike fish, mammals, and most other animals, jellyfish do not have a centralized brain, heart, or skeleton. Instead, they rely on a simple nerve net to sense their surroundings and control their movements.

☆Jellyfish do not have a heart, blood, or blood vessels. Oxygen and nutrients diffuse directly through their thin body layers.

☆Unlike fish, which have scales and skeletons, jellyfish have a soft, gelatinous body composed mostly of water (about 95%). Their bell-shaped structure, or medusa, pulsates to help them move through the water.Unlike fish, which have scales and skeletons, jellyfish have a soft, gelatinous body composed mostly of water (about 95%). Their bell-shaped structure, or medusa, pulsates to help them move through the water.

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Jellyfish are truly fascinating creatures, combining simplicity with remarkable survival abilities. Their ancient origins, unique biology, and unusual life cycle make them stand out among marine animals. From their brainless yet efficient way of living to the almost "immortal" capabilities of some species, they challenge what we think we know about life and aging.

Despite their delicate, drifting nature, jellyfish play a crucial role in ocean ecosystems as both predators and prey. Their increasing populations in some areas also remind us of the impact of climate change and human activities on marine life.

Overall, jellyfish are a perfect example of how nature finds diverse ways to thrive, proving that even the simplest creatures can have the most complex survival strategies.

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Jellyfish are fascinating marine creatures that have existed for over 500 million years, making them one of the oldest living species on Earth.

Jellyfish are known for their soft, gelatinous bodies and tentacles lined with specialized cells called nematocysts, which contain stinging structures used for defense and capturing prey. They lack a brain, heart, and bones, relying on a simple nerve net to sense their environment.

Jellyfish can be found in oceans worldwide, from surface waters to deep-sea environments. Some species glow through bioluminescence, while others have complex life cycles that include both sessile (polyp) and free-swimming (medusa) stages.