You can afford to keep a lot of different genes around now, so you can survive pretty much wherever you go, on whatever you find.
However, you're one of the smallest, weakest life forms around, because at this time, the eukaryotes, with their big, multi-layered walls, have grown up. They like eating you, like a little snack.
Wouldn't it be nice to be big and tough like them? Well you might have the options: what if you get inside one in a failed snack attack, and stay in there, acting like a little chemistry factory, making food for them? Better to feed than be food? Or better to stay on the outside, maybe get faster, or hide away?
Join a gang?
Play your own game?
Evolution starts with the Last Universal Ancestor.
You can find out what happened before evolution here.
You can also short-cut to Land plants, or Animals
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