Just because a bacteria hasn't evolved up into a higher form if life, doesn't mean there isn't evolution. If a bacteria is good at what it does and has no need to change, it won't. There is no "constant rate" of evolution that has to happen. If some sort of animal evolves to be perfectly calibrated for living in a puddle of water at the bottom of a cave, and that puddle stays exactly the same for a trillion years, that animal will stay pretty much the same for that amount of time. Bacteria don't NEED to evolve into a higher form, so they don't.
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