Скачать или смотреть Animal on earth that doesn't age at all

The animal on Earth that doesn't age at all, or at least shows no signs of biological aging, is the immortal jellyfish (Turritopsis dohrnii), a tiny creature about the size of a pinky nail that can revert its life cycle from adult medusa form back to a juvenile polyp stage through a process called transdifferentiation, essentially restarting its life whenever stressed, injured, or reaching maturity, which allows it to potentially live indefinitely unless killed by predators, disease, or environmental factors.

This ability stems from its simple cellular structure and genetic mechanisms that reprogram cells to an earlier state, unlike most animals where aging involves telomere shortening, cellular senescence, and accumulated damage over time; while not truly "immortal" in the sense of being indestructible, it defies the typical aging process seen in complex organisms like humans, and researchers study it for insights into regeneration and longevity. Other candidates like the hydra (a freshwater polyp) also exhibit negligible senescence by continuously renewing their stem cells, but the jellyfish's cycle reversal makes it the standout example of biological immortality in the animal kingdom.