Theoretically, this process can go on indefinitely, effectively rendering the jellyfish biologically immortal,[3][6] although in practice individuals can still die. In nature, most Turritopsis dohrnii are likely to succumb to predation or disease in the medusa stage without reverting to the polyp form.[7] --WP

https://en.wikipedia.org/wiki/Turritopsis_dohrnii

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[–] 3 points 1 month ago

Yeah, that works for fiction. In the real world though, nothing can survive entering a black hole for example. So your definition of immortal is pretty useless outside of fiction.

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