Waɗannan ƙwayoyin kakannin duniya sun kasance prokaryotic kuma mai yiwuwa methanogen ne wanda ke da amino acid mai yawa, nucleotide, carbohydrate da lipid metabolism. Rike waɗannan tsoffin hanyoyin yayin juyin halitta na baya na iya zama sakamakon waɗannan halayen sun kasance mafita mafi kyau ga matsalolin su na musamman na rayuwa, tare da hanyoyi kamar glycolysis da citric acid cycle suna samar da samfuran su na ƙarshe sosai kuma cikin ƙarancin matakai. Hanyoyin farko na tushen enzyme na iya zama ɓangarorin ƙwayoyin nucleotide, yayin da suke wani ɓangare na RNA na rayuwa.
ƙwayoyin cuta