Nothing can be said to be certain except death and taxes But there is one creature inconvenienced by neither. jellyfish are considered biologically immortal according BBC Science discovery. BBC explains that the Turritopsis dohrnii jellyfish species is known as the immortal jellyfish because it can return to an earlier stage of development if it is injured or its life otherwise threatened.
When the medusa the immortal jellyfish Turritopsis dohrnii ldies, it sinks to the ocean floor and begins to decay. Amazingly, its cells then reaggregate, Turritopsis dohrnii, the so-called “immortal jellyfish,” can hit the reset button and revert to an earlier developmental stage if it is injured.
It’s impossible to determine an average lifespan for the jellyfish Turritopsis dohrnii, because it does not die of natural causes. By continuously reverting. if the jellyfish suffer “physical damage or even starvation, they take a leap back in their development process, transforming back into a polyp.
The reason Turritopsis dohrnii is able to do this is a rare process known as cellular transdifferentiation, according to BBC Earth.Even when the jellyfish dies, it can amazingly come back to life. The dead medusa sinks to the ocean floor and starts to decay.
 But then its cells start to gather together, not into a new medusa, but into polyps, and from these polyps emerge new jellyfish, BBC Earth says. The jellyfish has skipped to an earlier life stage to begin again. Every animal and human beings die except jellyfish.
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