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[Free Registration/Login Required] The article "The Rise of Oxygen in the Earth's Atmosphere" from the American Museum of Natural History focuses on when the rise of oxygen in the earth's atmosphere began. A Step Read, a question set, and a vocabulary worksheet for the word "accumulate" are provided.
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- Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)
- The intended use for this resource is Instructional|practice
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