This lesson, supported by the provided power point lecture (LESSON 1 and 2 Ecology Lecture Supplement ), introduces students to the concepts of food chains and food webs. Through its use, students learn the difference between producers and consumers and study how these organisms function within their communities to interact in various food chains. Multiple food chains link together to form intricate and balanced food webs. Focus continues to rest on the Sonoran Desert. At the conclusion of this lesson, students are asked to construct a food web using endemic desert species.