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describe the most important evolutionary event in any branch of the tree of life and its...

describe the most important evolutionary event in any branch of the tree of life and its outcomes?
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One of the most important events in the tree of life is The Great Oxidation Event This event is also known by the names: The great Oxygenation Event, Oxygen Catastrophe, Oxygen Crisis, and, Oxygen Revolution

It was a period in the tree of life when the amount of oxygen rose in the atmosphere of Earth as well as shallow ocean of Earth. This rise in oxygen was caused by the actions of cyanobacteria.The cyanobacteria by photosynthesis produced oxygen in the atm. Oxygen was in diatomic form. That is O2. And thus, it changed Earth's atmosphere from a weakly reducing atmosphere to an oxidizing atmosphere. This lead to the mass extinction of many existing species of that time, mostly anaerobic bacterias. This event happened to aid the growth in the diversity of minerals. And mainly, it lead to tthe origin of eukaryotic organisms. And it also lead to the formation of multicellular organisms.

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