Geological evidence reveals that the atmosphere on Earth originally lacked oxygen. What process initiated the build-up of oxygen in the atmosphere?

a. Fixing carbon dioxide from the atmosphere resulted in oxygen being emitted.
b. The formation of ATP and harvesting of the energy in chemical bonds resulted in oxygen being released.
c. Water, used as a hydrogen source, resulted in oxygen as a waste product.
d. The first terrestrial plants utilized carbon dioxide and gave off oxygen, just like plants today.


c. Water, used as a hydrogen source, resulted in oxygen as a waste product.

Biology & Microbiology

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