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Lena told us about the theory of symbiogenesis in a way that I could understand. What I got out of it is that one day some prokaryotes had a threesome (or a twosome), liked it and decided to stay together. That's how eukaryotic cells were formed, which then formed into cell clusters of various kinds, with the goal of eating more and better than other cell clusters.
You can find out more by reading the works of Alexander Markov and Richard Dawkins.