It may have mutated to deal with radiation but radiation friendly organisms have been around for millions of years. Desulforudis audaxviator lives miles underground living on radioactive decay products.
>As the environment at that depth is so much like the early Earth, it may indicate what types of organisms existed before there was an oxygen atmosphere. Billions of years ago, some of the planet's first bacteria may have thrived in similar conditions. https://en.wikipedia.org/wiki/Desulforudis_audaxviator
>As the environment at that depth is so much like the early Earth, it may indicate what types of organisms existed before there was an oxygen atmosphere. Billions of years ago, some of the planet's first bacteria may have thrived in similar conditions. https://en.wikipedia.org/wiki/Desulforudis_audaxviator