Biology, 25.06.2019 23:20, hwang258

Which of the following describes the importance of cyanobacteria to early earth atmospheric formation? a) cyanobacteria released oxygen into the air, creating a protective ozone layer b) cyanobacteria released 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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Which of the following describes the importance of cyanobacteria to early earth atmospheric formatio...