Which of the following factors likely contributed to the accumulation of O₂ within Earth's atmosphere?

Question

Quizplus · Accepted Answer

All of the factors listed likely contributed to the accumulation of O₂ within Earth's atmosphere. Cyanobacteria were likely responsible for the initial increase in atmospheric oxygen, but other factors such as the cycling of oxygen during the carbon cycle, the slight decoupling between photosynthesis and respiration, and the release of O₂ as a product of photosynthesis also played a role in increasing atmospheric O₂ levels.

Which of the Following Factors Likely Contributed to the Accumulation