Isbedelka weyn ee soo socda ee qaab dhismeedka unugyada ayaa yimid markii bakteeriyada ay liqday unugyada eukaryotic, oo ku jira urur iskaashi oo loo yaqaan endosymbiosis. Bakteeriyada la liqday iyo unugyada martida loo yahay ayaa markaa la kulmay isbadal wadajir ah, iyadoo bakteeriyadu u soo baxday midkood mitochondria ama hydrogenosomes. Hal mar oo kale oo lagu liqo noolaha loo yaqaan cyanobacterial-like cyanobacterial waxay keentay sameynta chloroplasts ee algae iyo dhirta. Taariikhda nolosha waxay ahayd in eukaryotes unugyada eukaryotes, prokaryotes iyo arthropods ay u muuqdeen qiyaastii 610 milyan oo sano ka hor markii ay kuwan noolaha badan ee badan ee badweynta badan ay u muuqdeen noolaha badan ee u madax banaan ee badweynta badan ee badweynta badan ee loo yaqaan cyanobacteria ilaa qiyaastii 155 milyan oo sano ka hor.
1.6 ilaa 2.7 bilyan oo sano ka hor