Microorganisms have a huge advantage over us meat giants. Consider how much effort it takes you to make even a single copy of yourself and your trillions of cells. To multiply you first need to find another flesh giant that thinks you are cute. Then you need to go through a complicated dance that hopefully leads to the merger of two cells from you two. And then you need to wait for months and months while the merged cell multiplies over and over and over, until it has become a few trillion cells and is released into the world as a hopefully healthy human. And even then you only have produced a
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