Hmm. It's all very well being free-floating stinging blobs, drifting into food-rich waters, but that can't be quite enough. What happens if you drift into a still water area where there is no food?
Over time, those of you who wiggle a bit when you get stuck have a better survival rate, and pass on your genes, and the wiggle improves until you are able to swim, albeit very slowly.
This takes a very very long time, and during that time, other animals have developed. You are now also a marvellous passing snack for other creatures.
Perhaps you need a defence of some kind? Would a shell work?
Shelled jellies
Shell-less jellies
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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