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The process that is hypothesized to be responsible for the free oxygen in our atmosphere began...

The process that is hypothesized to be responsible for the free oxygen in our atmosphere began with the ?
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The process that is hypothesized to be responsible for the free oxygen in our atmosphere began with the EVOLUTION OF OXYGENIC PHOTOSYNTHESIS PROCESS.

The primitive earth contained predominantly a reducing environment. It favored the stabilization of intermediate life forms.

The evolution of photosynthetic bacteria triggered the production oxygen. This rapidly lead to the great oxygenation event and replaced the reducing environment with the oxidizing environment.

The oxidizing environment eliminated the intermediate unstable life forms and produced stable forms.

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