One thing to consider is that even though bacteria can colonize some sterile object, they don’t seem to be able to create their own self sustaining biome. As fa

One thing to consider is that even though bacteria can colonize some sterile object, they don’t seem to be able to create their own self sustaining biome. As far as we know there are no species that can truly exist independently without any resources generated from some other species. Which makes sense because full autonomy would be more costly than simply relying on organic products made by some other species in the biosphere. For instance, all Vitamin B is produced by bacteria and more complex organisms depend on it as a nutrient rather than producing it on their own.