Question HLPaper 1AAnswerThe first iron ore deposits in rocks appeared about 1.8 billion years ago. What took place to make this occur?ASome prokaryotic organisms began to absorb carbon dioxide from seawater.BSome eukaryotic organisms began to absorb carbon dioxide from seawater.CSome prokaryotic organisms began to release oxygen into seawater.DSome eukaryotic organisms began to release oxygen into seawater.
