The age of the Earth is 4.6 billion years. For what percentage of this time is Earth thought to have been anaerobic?

Name: The age of the Earth is 4.6 billion years. For what percentage of this time is Earth thought to have been anaerobic?
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Scientists believe that oxygen did not appear on Earth until about 2.5 billion years ago, which means for the first 2.1 billion years of the Earth's existence, it was likely anaerobic. Therefore, the percentage of time that Earth was anaerobic is approximately 44%.

The Age of the Earth Is 4