The document discusses trophic levels and the food web within an ecosystem. It explains that producers such as plants produce their own food, primary consumers eat producers, and secondary consumers eat primary consumers. Decomposers decompose all levels of the food web. The document instructs the reader to create a trophic level pyramid showing producers, consumers, and decomposers for an ecosystem by choosing one and reading additional pages for more details.

6. Read pages 17 - 21