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Guide Questions: 1. How has the atmosphere changed from that of the early Earth? 2. Explain how water pollutants affect the water cycle. 3. Cite (3) pollutants of air, water, and land. Explain where these pollutants.com froni and whar are the effects it has on humans and the environment,
The second process that changed Earth's early atmosphere was photosynthesis (Figure 12.14). ... Photosynthesis takes sunlight, carbon dioxide, and water and produces sugar and oxygen. Photosynthesis contributed oxygen to Earth's early atmosphere and helped change it from one rich in carbon dioxide to one rich in oxygen
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