The Living Environment The study of organisms and their interactions with the environment. Topics Unit 1: Ecology Unit 2: The Cell Unit 3: Genetics Unit 4: History of Biological Diversity Unit 5: The Human Body Unit 1: Ecology Principles of Ecology Communities, Biomes, and Ecosystems Population Ecology Biodiversity and Conservation Ecology The study of living organisms and their interaction with the environment. Biosphere The portion of Earth that supports life. Ecosystem a biological community and all of the abiotic factors that affect it. BIOTIC FACTORS ABIOTIC FACTORS Producers (plants) Atmospheric gases (air) Consumers (Herbivores/Carnivores) Water Decomposers (bacteria/fungi) Sunlight other Single-celled Organisms Rocks and other soil sediment