- For each trophic level write one or two sentences explaining the role of that type of organism. You should include those organisms that fall outside the normal pyramid. Give an example of each type of organism.Your examples do not have to belong to the same food chain in real life. Why does the pyramid get narrower at each higher level? (Look up Energy pyramid)
2. What is an environmental sphere or earth system sphere? Name the earth’s five major environmental spheres and state the defining characteristics of each. Give one example of a way in which two or more earth system spheres interact.
3. What is biogeochemical cycling? For each of the following five cycles, state two processes in which matter changes its form: carbon, phosphorus, nitrogen, oxygen, and sulfur.