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Geography, 23.11.2019 07:31 Blazingangelkl

Imagine that scientists have discovered a new planet that is apparently devoid of life but has ice caps located at the poles. these ice caps reveal that the planet's atmospheric o2 levels sharply increased about 1,000,000 years ago but then quickly dropped 50,000 years ago. what could account for these changes in atmospheric o2 levels?

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