Trophic level made of organisms that feeds primarily on primary producers secondary consumers O primary consumers o tertiary consumers decomposers O quaternarty consumers QUESTION 3 The efficiency of nutrient flow from one trophic level to the next averages O 15 Oooo 5 10 25 QUESTION 4 Organisms that form the energy or food base of any ecosystem are O primary consumers decomposers primary producers autotrophs two of these QUESTION 5 A self sustaining ecological unit composed of many species and all abiotic factors within a defined area. This has the structure to support nutrient and food flow. ecosystem O biosphere O population O biome community

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