Awọn eukaryotic awọn sẹẹli farahan laarin 1.6 <unk>2.7 bilionu ọdun sẹyin. Awọn wọnyi pataki ayipada ninu cell be wá nigbati awọn bacteria won engulfed nipa eukaryotic sẹẹli, ni a ifowosowopo isopọ ti a npe ni endosymbiosis. awọn engulfed bacteria ati awọn oluwa sẹẹli ki o si underwent coevolution, pẹlu awọn bacteria evolving sinu boya mitochondria tabi hydrogenosomes. miran engulfment ti cyanobacterial bi cyanobacterial organisms mu si awọn agbekalẹ ti chloroplasts ni algae ati eweko. awọn itan ti aye ni wipe awọn unicellular eukaryotes, arthropods ati prokaryotes farahan nipa 610 milionu ọdun sẹyin nigba ti awọn oniwe-multicellular organisms farahan ni awọn oniwe-multiple cyanobacterians ni ayika 155 milionu ọdun sẹyin.
1.6<unk>2.7 bílíọ̀nù ọdún sẹ́yìn