The eukaryotic masero yakabuda pakati 1.6 uye 2.7 mabhiriyoni emakore akapfuura. The chikuru kuchinja rinotevera muchitokisi maumbirwo akauya apo utachiona vakanga yakanyura eukaryotic masero, mune pamwe kushamwaridzana inonzi endosymbiosis. The yakanyura utachiona uye mueni sero ipapo coevolution, pamwe utachiona kuchinja kuva kana mitochondria kana hydrogenosomes. mumwe engulfment pamusoro cyanobacterial-kufanana zvipenyu zvakatungamirira paumbwe chloroplasts mu algae uye miti.
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