Immortality;Is the word out there?,Nature had developed the first Immortal species.

Turritopsis nutricula
Kingdom: Animalia
Phylum: Cnidaria
Class: Hydrozoa

Turritopsis nutricula or immortal jellyfish is a hydrozoan whose medusa, orjellyfish, form can revert to the polyp stage after becoming sexually mature. It is the only known case of a metazoan capable of reverting completely to a sexually immature, colonial stage after having reached sexual maturity as a solitary stage.It does this through the cell development process of transdifferentiation. Cell transdifferentiation is when the jellyfish "alters the differentiated state of the cell and transforms it into a new cell. In this process the medusa of the immortal jellyfish is transformed into the polyps of a new polyp colony.

This ability to reverse the life cycle (in response to adverse conditions) is probably unique in the animal kingdom, and allows the jellyfish to bypass death, rendering Turritopsis nutricula potentially biologically immortal. Studies in the laboratory showed that 100% of specimens could revert to the polyp stage, but so far the process has not been observed in nature, in part because the process is quite rapid and field observations at the right moment in time are unlikely.In spite of this remarkable ability, most Turritopsismedusae are likely to fall victim to the general hazards of life as plankton, including being eaten by other animals, or succumbing to disease.