Which of the following describes the importance of cyanobacteria to early Earth atmosphere formation?
A.) Cyanobacteria released oxygen into the air, creating a protective ozone layer
B.) Cyanobacteria relased nitrogen into the air, creating a protective ozone layer
C.) Cyanobacteria absorbed excess oxygen from the air, creating proper amounts of atmospheric oxygen
D.) Cyanobacteria absorbed excess carbon dioxide from the air, creating a protective ozone layer
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