6–8% of the AP exam. Key topics: Ecosystem types and structure, Terrestrial biomes (tropical rainforest, temperate deciduous forest, grassland, desert, tundra, taiga), Aquatic biomes (freshwater, marine, estuaries, wetlands), Biogeochemical cycles: carbon cycle, Biogeochemical cycles: nitrogen cycle, Biogeochemical cycles: phosphorus cycle, Biogeochemical cycles: hydrologic (water) cycle, Gross primary productivity (GPP) and net primary productivity (NPP), Trophic levels and energy flow, Food chains and food webs, Energy transfer efficiency (10% rule).
Study guide content for this unit is being prepared. Check back soon for complete lesson notes, formula sheets, and worked examples.
