Study Guide: Benchmark 3
Standard 6.b – Know how to analyze changes in an ecosystem resulting from changes in climate, human activity, invasive species, or changes in population.
1)	What is a reason for a decline in species diversity in lakes near coal powered power plants?
2)	What would happen if most of the rainforests were destroyed?
3)	What environmental problem would likely be associated with the drop in population of a native species because the introduction of an invasive species introduced by people?
Standard 6.d – Know how carbon and nitrogen cycle between non-living resources and organic matter in the ecosystem and who oxygen cycles via photosynthesis and respiration.
4)	In the water cycle, how is water returned to the atmosphere?
5)	What are the 2 processes in which organisms use and release oxygen into the atmosphere?
6)	Which type of organism is most important to the nitrogen cycle?
7)	How is atmospheric carbon removed during the carbon cycle?
Standard 6.f – Know that at each link in a food web, some energy is stored in newly made structures, but much is lost to the environment as heat. This relationship can be represented by a food pyramid.
8)	Why is an energy pyramid small at the top and large on the bottom?
9)	Why is there less energy available at the top of an energy pyramid?
10)	How much energy is transferred at each level of the energy pyramid?
11)	What happens to the energy passed from organism to another in a food web?