You are given a sentence in English. Your job is to translate the English sentence into Spanish.

There are species that have no aging — Hydra for example — but they do it by not having a nervous system — and not having any tissues in fact that rely for their function on very long-lived cells.
Hay especies que no envejecen, Hydra por ejemplo, pero lo logran no teniendo un sistema nervioso... y no teniendo ningún tejido que dependa para su funcionamiento de células de muy larga vida.