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| A Definition of Environment The Organization of Ecological Systems Energy Flow in Ecosystems Community Interactions Types of Terrestrial Communities Temperate Deciduous Forest Grassland or Prairie Savanna Desert Boreal Forest Temperate Rainforest Tundra Tropical Rainforest Types of Aquatic Communities Marine Communities Freshwater Communities Estuaries Community, Habitat, and Niche A Closer Look: The Importance of Habitat Size Kinds of Organism Interactions Predation Parasitism Commensalism Mutualism Competition The Cycling of Materials in Ecosystems The Carbon Cycle The Nitrogen Cycle A Closer Look: Carbon Dioxide and Global Warming The Phosphorus Cycle Population Characteristics The Population Growth Curve Population-Size Limitations Limiting Factors to Human Population Growth Human Population Growth and the Global Ecosystem |