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Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today. A. lead B. hydrogen C. oxygen D. ore
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Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today.

A. lead
B. hydrogen
C. oxygen
D. ore

User TomDK
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Ancient cyanobacteria released hydrogen which assisted in creating the atomsphere as we know it today.
User Hennessey
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