"Paleoproterozoic"@en . "The Paleoproterozoic (pronounced /\u02CCpe\u026Al\u026A.o\u028A\u02CCpro\u028At\u0259r\u0275\u02C8zo\u028A.\u0268k/, also spelled Palaeoproterozoic) is the first of the three sub-divisions (eras) of the Proterozoic occurring between 1,600 to 2,500 million years ago. This is when the continents first stabilized. This is also when cyanobacteria evolved, a type of bacteria which uses the biochemical process of photosynthesis to produce energy and oxygen."@en . . "The Paleoproterozoic (pronounced /\u02CCpe\u026Al\u026A.o\u028A\u02CCpro\u028At\u0259r\u0275\u02C8zo\u028A.\u0268k/, also spelled Palaeoproterozoic) is the first of the three sub-divisions (eras) of the Proterozoic occurring between 1,600 to 2,500 million years ago. This is when the continents first stabilized. This is also when cyanobacteria evolved, a type of bacteria which uses the biochemical process of photosynthesis to produce energy and oxygen."@en . .