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4.Explain how the percentages of nitrogen, oxygen, and carbon dioxide in the Earth's atmosphere today have changed from the Earth's early atmosphere.

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haneenafifi2006

Answer:

The new estimates suggest that atmospheric oxygen levels have fallen by 0.7 percent over the past 800,000 years. The scientists concluded that oxygen sinks processes that removed oxygen from the air were about 1.7 percent larger than oxygen sources during this time.

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