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//@astrovia1: If an immortal jellyfish (Turritopsis dohrnii) is exposed to environmental stress or physical assault, or is sick or old, it can revert to the polyp stage, forming a new polyp colony.[6] It does this through the cell development process of transdifferentiation, which alters the differentiated state of the cells and transforms them into new types of cells.Tardigrades are able to stop their metabolism and become immortal (state cryptobiosis). These qualities make it an amazing super champion resistance animal. In the laboratory, scientists have managed to maintain eight years in a state of cryptobiosis and tardigrades have returned to life. To enter cryptobiosis, tardigrades retract their eight legs and is almost completely dehydrated. They lose more than 99% of their water, replacing it with a sugar they synthesize.Hydra are known for their regenerative capabilities. Most of their body cells are stem cells, Martinez said. These cells are capable of continuous division and differentiation into any cell type in the body. In humans, such "totipotent" cells are present only in the first few days of embryonic development. Hydra, by contrast, constantly renew their bodies with fresh cells.Follow @astrovia1 for More Amazing Stuff About Space & Science 🚀