Assess students' ability to analyze energy flow and species interactions in a freshwater pond food web: identify producers, consumers (primary, secondary, tertiary), and decomposers; interpret or construct a food web and corresponding energy pyramid using the 10% energy-transfer rule; calculate approximate energy available at successive trophic levels from provided data; and predict ecological effects of adding or removing species, explaining trophic cascades, competition, and predator-prey relationships. Include a simple diagram or data table for analysis.