According to the Figure Shown Below, Approximately How Many Years

question 28

Multiple Choice

According to the figure shown below, approximately how many years ago did oxygen finally get to half its current abundance in Earth's atmosphere?

• A) 3 billion years ago
• B) 1 billion years ago
• C) 0.6 billion years ago
• D) 0.25 billion years ago
• E) 0.1 billion years ago

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