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The Nature of the Environment
The Major Biotic Regions
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abundant acres activities agricultural America amount animals areas become biotic California carried cause cities climate communities complete conservation continued countries crops damage dams demand dependent early earth economic effects efforts energy environment environmental erosion exist factors farming federal fertility fire fish fisheries flood forest further future grazing ground grow growth human important increase industry interest irrigation lakes land less limited living maintain major materials means million minerals mountains move natural North numbers nutrients ocean once organic parks percent period planning plant pollution population practices present preservation problems production protection range reached recreation region relatively remains result river Service soil sources species streams supply surface tion trees tropical United urban vegetation western wild wildlife yield York zone