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

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

User Tmlen
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The ancient cyanobacteria releases oxygen which assisted in creating the atmosphere as we know it today.  This bacteria can perform photosynthesis and are similar to the plants or trees. Their photosynthesis produces oxygen changed the atmosphere made it oxidizing. Cyanobacteria is also called as Cynophytha. 
User Sandwood
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