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About the same. About a half billion years ago it was significantly higher, and more than a billion years ago it was lower, much lower. Before 1.5 or 2 billion years ago there was no free oxygen in the atmosphere, before 3 billion years ago there wasn't any.

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Q: Is the current oxygen content of the atmosphere lower or higher or about the same as is was millions of years ago?
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Is the current oxygen content of the atmosphere lower higher or about the same as it was millions of years ago?

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