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Cyanobacteria played a crucial role in transforming Earth’s early environment through their ability to perform oxygenic photosynthesis, a process that converts carbon dioxide and water into organic compounds and releases oxygen as a byproduct. Before the emergence of cyanobacteria, Earth’s atmosphere was largely anoxic, containing very little free oxygen. The proliferation of cyanobacteria in ancient oceans, particularly in stromatolite-forming _________ _______ _________ ______ __________ _____ ______ ___ _________ __________ ______.
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