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13 Vocabulary Ecosystem Interacting groups of species and their physical environment Autotroph Are photosynthetic and make their own food Heterotroph Can’t make their own food and must eat to live Trophic Level Feeding level, an organism’s position in a pyramid or chain Herbivore Primary consumers that eat plants only Carnivore Secondary and tertiary consumers that eat just meat Omnivore Eat both plants and animals Detrivore Return organic materials to the environment by breaking down dead organisms Energy Pyramid Organization of a food chain illustrating the energy available (and lost) at each level Abiotic Non-living things Biotic Living things Biomass The weight of each trophic level


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