During which geologic eon did the amount of oxygen in the atmosphere approach modern levels?
A)the Archean
B)the Phanerozoic
C)the Hadean
D)the Protorozoic

Name: During which geologic eon did the amount of oxygen in the atmosphere approach modern levels? A)the Archean B)the Phanerozoic C)the Hadean D)the Protorozoic
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Question

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The Proterozoic eon is when the Great Oxidation Event occurred, leading to a significant increase in atmospheric oxygen, approaching modern levels.

During Which Geologic Eon Did the Amount of Oxygen in the Atmosphere