In this activity about food webs, students learn that producers make all of the molecules they need from simple substances and energy from the sun, other living things depend on producers for food, and living things that must eat other organisms as food are known as consumers. Food webs show all of the various interactions among producers and consumers in an ecosystem. Following an introduction to the content, students are divided into six groups and given a set of six cards, each of which represents a producer or consumer, unique to one of six different ecosystems. From the set of cards, students identify the producers and consumers, discuss who might eat whom, and construct an illustration of the possible food web configurations.