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As Earth's surface cooled and cyanobacteria evolved, which of the following gases was released into the atmosphere?

As Earth's surface cooled and cyanobacteria evolved, which of the following gases was released into the atmosphere?
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As Earth's surface cooled and cyanobacteria evolved, which of the following gases was released

into the atmosphere?

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User Waltflanagan
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User Miguel Grinberg
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