How was free {O_2} released into the Earth's | vedclass

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(B) At the time of the origin of life,the Earth's atmosphere was reducing in nature and lacked free oxygen $({O_2})$. With the evolution of photosynth

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By photosynthetic activity

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(B) At the time of the origin of life,the Earth's atmosphere was reducing in nature and lacked free oxygen $({O_2})$. With the evolution of photosynthetic organisms,specifically cyanobacteria (blue-green algae),the process of photosynthesis began. During photosynthesis,these organisms used water $({H_2O})$ as an electron donor,which resulted in the release of oxygen $({O_2})$ as a byproduct into the atmosphere. This gradual accumulation of oxygen eventually led to the formation of an oxidizing atmosphere,which supported the evolution of aerobic life forms.

How was free ${O_2}$ released into the Earth's atmosphere,given that there was no free ${O_2}$ at the time of the origin of life?

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