What processes led to 20% oxygen in earths atmosphere, Other Subject

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What processes led to 20% oxygen in earths atmosphere

Question: Choose the correct statement about the processes that led to 20% oxygen in Earth's atmosphere. Need Assignment Help?

Early life on Earth required an oxygen-rich atmosphere to form chemical bonds, which caused the oxygen levels to stabilize.
Lightning energy and UV radiation altered the combination of gases in the atmosphere so that oxygen levels increased.
Photosynthesis was not possible on Earth until the ozone layer formed, which raised oxygen levels.
Early life-forms released oxygen, which saturated the oceans and the atmosphere.

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What processes led to 20% oxygen in earths atmosphere

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