Cyanobacteria play a major role in maintaining our Earth's modern atmospheric content. What historical role did Cyanobacteria play (if any) in the development of the atmosphere we have today? Select ALL that apply Cyanobacteria did not play a role in the development of the atmosphere of early Earth Because Cyanobacteria produce oxygen, it was possible for the ozone to form Cyanobacteria were the first oxygen-producing phototrophs and contributed large amounts of oxygen to the atmosphere As Cyanobacteria populations grew, they fixed massive amounts of carbon from the atmosphere and sequestered it into their bodies, thereby reducing greenhouse gas emissions
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