Medusa Turritopsis dohrnii. This may return to the first stages of the development of organism. If the environmental conditions deteriorate or if the jellyfish receives damage, then it does not die, but it is converted again polype. An adult jellyfish later grows. This process is called transdix. In theory, it can continue infinitely, but in the wild nature, most of this jellyfish dies without having time to use it: due to predators and negative environmental conditions.
Monorhaphis Chuni sponges. These creatures are almost aging and they regain the damaged parts of the body due to regeneration. In the sponge, the renewal system is based on fixed cell update. Therefore, they can live for thousands of years. However, they are not immortal, because they may die due to mechanical damage, environmental changes and diseases.
Omara. Throughout their lives, they updated their body tissues and remained as the high level of telomerase enzymes responsible for the restoration of DNA. This ensures that lobsters remain stronger and active for longer. However, over time, the shells become very heavy and melting requires large energy costs. These animals die not from old age, but from physical restrictions.
Source: Ferra
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