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Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today

Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today
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Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today

User Meverett
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Ancient cyanobacteria released oxygen which assisted in creating the atmosphere as we know it today.
User Eric Ihli
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