Significance of prokaryote evolution to enable multi-cellular life to exist?

[MrTristan]

That is, if these cells even had anything to do with it. We're only going by the endosymbiotic theory.

[iansmith]

endosymbiotic theory and the step from unicellular to multi-cellular evolution are not necessarily related. Furthermore, multicellular organization can be seen in bacteria, to a certain extent. The evolution to multicellular organisms from unicellular probably started in eukaryotes independently of the prokaryotes.