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How were life forms affected by the rise in atmospheric oxygen levels that began 2.2 billion years ago?

How were life forms affected by the rise in atmospheric oxygen levels that began 2.2 billion years ago?
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How were life forms affected by the rise in atmospheric oxygen levels that began 2.2 billion years ago?

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User Highend
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Increase in size was one affect, also the increase of oxygen also affected the temperature
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User Kim Larsen
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