Assess students' ability to analyze energy flow and trophic interactions in a freshwater pond by identifying producers, consumers, and decomposers; constructing and interpreting food chains and food webs; applying the 10% energy-transfer rule to estimate energy or biomass changes between trophic levels; predicting ecological consequences of species removal or population shifts; interpreting simple data/diagrams; and evaluating basic human impacts (e.g., eutrophication). Suitable for grades 6–8.