There’s really no such thing as immunity to radiation – organisms like tardigrades that are reported on as if they’re totally immune to it are in fact merely resilient against the damage it causes, whether through simplicity or redundancy or the ability to repair the damage, but in any case there is a threshold beyond which even resilient organisms will be killed. That resilience can be evolved to some extent, but the more complex an organism the more ways ionizing radiation can damage things in a way that is catastrophic and/or irreparable.
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