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Section 1 Introduction: Air Pollution
The air we breathe plays an important role in maintaining all life on Earth. For example, the atmosphere is a major part of the water cycle. It refills rivers and lakes with fresh water from precipitation. In addition, the atmosphere provides organisms with the gases needed for life. It contains oxygen needed for cellular respiration and carbon dioxide needed for photosynthesis. It also contains nitrogen needed for proteins and nucleic acids.
Earth’s atmosphere
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