This document appears to be an exam for an ecology course covering key concepts. It includes identification questions to define terms like organism-environment interaction, biotic potential, and carrying capacity. It also includes modified true/false questions to correct statements about rocks/minerals, pollution, and producers. Students are asked to list ecosystems, biotic factors, steps in the hydrologic cycle, principal loops, and abiotic factors. Finally, there are explicit explanation questions about matter, ecosystem function, human impacts on biogeochemical cycles, and comparing cornucopianism and environmentalism.