This 3-page worksheet encompasses the idea of classification. It explores classification keys, and the 6-kingdom classification scheme. This worksheet is meant to be either a stand alone worksheet or can go along with lecture. Even though classification was not a standard in California High School Biology, I still think it is an important thing for kids to learn about. Sometimes, I assign this worksheet as week-end homework and sometimes I assign it as an end-of-the-year two-day assignment after testing is done. You can even have students work in groups to find the examples of organisms in magazines, etc.