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Which sentence describes what scientists think happened before life began on Earth A Prokaryotic cells...

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Which sentence describes what scientists think happened before life began on Earth A Prokaryotic cells formed when eukaryotes engulfed other eukaryotes B Oxygen levels increased due to cyanobacteria and the great oxidation event C Earth s cooling caused organic molecules to form in oceans D Columnar rock formations were formed by stromatolites near coasts

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