First we gained mithocondria and later we split in several branches. Some of the branches gained chloroplast. (IIRC there are three versions.) And some member

First we gained mithocondria and later we split in several branches. Some of the branches gained chloroplast. (IIRC there are three versions.) And some members of the branches got multicelular. A more technical and accurate version from https://en.m.wikipedia.org/wiki/Multicellular_organism https://en.m.wikipedia.org/wiki/Multicellular_organism > However, complex multicellular organisms evolved only in six eukaryotic groups: animals, symbiomycotan fungi, brown algae, red algae, green algae, and land plants. It evolved repeatedly for Chloroplastida (green algae and land plants), once for animals, once for brown algae, three times in the fungi (chytrids, ascomycetes, and basidiomycetes) and perhaps several times for slime molds and red algae.