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Many bacteria were protected from the ultraviolet radiation by the salt water in the ocean. In the sea bacteria made oxygen. Some of that oxygen escaped into the air and caused the earth surface to rust. After billions of years all the iron rusted in the sea and on the land. Then, when the oxygen was no longer used up in rusting iron, oxygen began to build in the atmosphere. The oxygen in the air blocked the deadly ultraviolet radiation from the sun, allowing life to evolve and migrate onto the land. Plants evolved and covered the earth and made it green.

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