For billions of years, life consisted of primitive, single-celled organisms. Eukaryotic and multicellular organisms only emerged between 2.5 and 2 billion years ago.
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Az élet évmilliárdokig primitív egysejtű organizmusokból állt. Az eukarióta és a többsejtű élőlények 2,5-2 milliárd éve jelentek csak meg.
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