Why Humans cannot be Turritopsis dohrnii ?

In simple words why are humans not immortal, before going to the topic of humans immortality I would like to give a briefing about Turritopsis dohrnii.

Turritopsis dohrnii, you may feel very uncomfortable with the name it is an immortal jellyfish. there is a process known as transdifferentiation which has the capability of reverting completely to sexual maturity as a solitary individual. I would like to compare it with the life cycle of a butterfly you may have studied the process known as metamorphosis in primary classes just think of the case in which an adult butterfly becomes pupa and pupa again matures to be a mature butterfly, when the butterfly gets aged it will go back again to the pupa stage by doing so it can be immortal. similar stages happen to this species of jellyfish in which the adult jellyfish goes back to the polyp stage and that is what is known as transdifferentiation.   

Let's come to our main topic human immortality, lots of efforts are being done to make humans immortal. in my virtue of point, we cannot be thor or captain America so as to remain immortal until somebody kills us. in the present scenario cryonics is the process of freezing our body after natural death many geeks spent money for cryonising their bodies after their death. we humans have stem cells that have the capability to repair and regrow themselves like hydra and liver but when we start ageing our stems cells gradually become tired of repairing and regrowing parts.

 In literature, immortality is eternal life having an unending existence.I am a person who compares life to a book, every day is a new chapter and a new page. a book is incomplete without the last page to complete the book with flourishing memories we all have to die one day.

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will be back with another dose if I am alive........