Oxygen was into ally created in earths atmosphere by___.

2 answers:

7 0

Here something that might help

Most scientists believe that for half of Earth's 4.6-billion-year history, theatmosphere contained almost no oxygen. Cyanobacteria or blue-green algae became the first microbes to produce oxygen by photosynthesis, perhaps as long ago as 3.5 billion years ago and certainly by 2.7 billion years ago.

kompoz [17]3 years ago

4 0

Blue-green algae........

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