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Unfortunately bacterium were unknown when reincarnation was written into indo-eruopean religions.
I was just thinking that meme perfectly illustrates the idea of reincarnation, though. Probably better than the [laughing and crying goat] (https://blogs.ed.ac.uk/teachingbuddhism/2020/06/03/the-goat-who-laughs-and-weeps/) parable.
I think it also depends on the reincarnation you're looking at. I only really know the eastern version from Hindu. Isn't there some Native American one where you are reborn as animals? I'm pretty sure Hindu has non-human life as a punishment for being bad. Could be wrong though I'm not an expert.
Bad Karma leads to reincarnation as an animal befitting the specific sin as well. Like pigs for gluttony. The idea of karma is neat.
Interesting. More information needed, before commenting. It may take some while of learning