According to the Following Figure, About How Long Ago Did

question 5

Multiple Choice

According to the following figure, about how long ago did oxygen reach its current abundance in Earth's atmosphere?

• A) 3 billion years ago
• B) 1 billion years ago
• C) 0.5 billion years ago
• D) 0.25 billion years ago
• E) 0.1 billion years ago

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