Being pretty small, and slow, you become a popular food for other organisms. You can swim away, but not quickly enough to escape. On the other hand, being small, it is pretty inexpensive to make lots and lots of offspring, and some of them will survive.
Even without a shell to make you safe or a a flap to make you fast, sheer cheapness and numbers can carry you through.
You could, however, improve your chances a bit by creating a colony: lots of similar creatures all working together as one big organism, instead of individual creatures. Of course, teamwork isn't always a success.
What's it going to be?
Lone Ranger?
Dirty Dozen?
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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