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1. Populations and Communities 2. Ecosystems and Biomes 3. Living Resources 4. Land, Water, and Air Resources 5. Energy Resource
1. Populations and Communities 2. Ecosystems and Biomes 3. Living Resources 4. Land, Water, and Air Resources 5. Energy Resource
1. Populations and Communities 2. Ecosystems and Biomes 3. Living Resources 4. Land, Water, and Air Resources 5. Energy Resource
1. Fresh Water 2. Freshwater Resources 3. Ocean Motions 4. Ocean Zones