Assess Grade 3–5 students' ability to analyze a local pond ecosystem by identifying organism roles (producers, consumers, decomposers), constructing and interpreting a food web that shows energy flow and trophic links, evaluating human impacts (pollution, habitat alteration, invasive species), and predicting ecological outcomes of environmental changes (nutrient runoff, drought, species removal). Require a labeled diagram, concise evidence-based explanations, and one realistic mitigation or monitoring recommendation.