This rigorous AP Biology Unit 8 assessment covers population ecology, community ecology, and biogeochemical cycles, with data analysis and higher-order reasoning built in. Designed to reflect College Board–style thinking, this test challenges students to interpret graphs, analyze tables, and apply ecological principles to real-world scenarios. Topics Covered: ✔ Nitrogen cycle (fixation, nitrification, assimilation, ammonification, denitrification) ✔ Carbon cycle (photosynthesis, respiration