Assess students' ability to analyze causes and ecological consequences of eutrophication in freshwater lakes: identify point and nonpoint nutrient sources (e.g., agricultural runoff, sewage, urban stormwater), explain processes (algal blooms, hypoxia, food-web shifts), interpret basic data (nutrient levels, chlorophyll a, dissolved oxygen), evaluate impacts on biodiversity and fisheries, and propose evidence-based mitigation strategies (buffer zones, nutrient management, treatment). Appropriate for grades 9–12; emphasis on data interpretation and reasoning.