Based upon the comparisons of anoxygenic and oxygenic photosythesis,the entry of oxygen into the atmosphere is most directly attributed to

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The entry of oxygen into the atmosphere is directly attributed to the evolution of photosystem II, which evolved in cyanobacteria and was responsible for the splitting of water during oxygenic photosynthesis. This splitting of water released oxygen into the atmosphere, leading to the oxygenation of the planet. Anoxygenic photosynthesis, on the other hand, does not involve the splitting of water or the generation of oxygen.

Based Upon the Comparisons of Anoxygenic and Oxygenic Photosythesis,the Entry