Outline:1) what is immortality?2) which organism is immortal?3) Life cycle of Turritopsis dohrnnii.Immortality;It's an ability of an individual to live forever Or mo

It's an ability of an individual to live forever Or more simply we can say that the infinite longevity of an organism is referred as immortality. In other words we can say an unending existence.

Till date, there is only one specie which is referred as immortal and that is 

 These little small organisms aren't localized to any region actually they can be found throughout the ocean. It's very interesting how they cheat death by reverting to the early stages of their life cycle. Following one simple diagram can elaborate the whole process; 

Life cycle of a new jelly fish starts with the fertilized egg. Which later on develops into larval stage called planula. After a quick swim, the planula latches onto the surface where it develops into a polyp (a tube shaped structure with a mouth on one end and a kind of foot on the other end). It remains stuck to the surface for a time being where it forms a little colony of the polyps who share feeding tubes with each other. One of these polyps will form an out growth referred as "Bud". 'Or' it may produce separate segments stacked on the top of one another that can then break away and form the Ephyra ( a small jelly fish ) and Medusa ( the fully matured adult jelly fish capable of reproducing). This stage is usually the end of the life span for the most of the jelly fishes but 

Turritopsis Dohrnii cheats the end of it's life cycle. As, when it is exposed to the environmental stress, it reverts back to the tiny blob of tissue which will then be converted into the polyps and the cycle will starts to repeat until it became mature adult again. It's the same as if the frog becoming a tadpole in stress condition and butterfly becoming a caterpillar.

They are not really immortal if they are being consumed by the predators. They can avoid or cheat natural death but they can't prevent accidental death. 

Biologically immortal organisms.

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