Hydra are an “advanced” type of organism. They do not age, so they do not die of old age. They are also immune to sickness because they eat bacteria, and live in an environment where it is unlikely to get sick. This classifies hydra as “immortal” organisms. The only way for them to die is if you kill them. Hydra are an advanced organism because no other organism on Earth is yet discovered to be unable to die of natural causes.
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