The seven activities contained in this book are designed to equip students (grades 9-12) with scientific tools and skills for understanding what introduced species are, how they impact natural processes and human systems, and what may be done about them. The activities are designed to link the biology and ecology of introduced species with insights and information derived from other disciplines and areas of study. Organizationally, the book's activities follow the journey of an introduced species once it reaches a new environment. Activities include: (1) Defining Native, Introduced, and Invasive Species; (2) Introduced Species Dispersal; (3) Competing; (4) Hybridizing; (5) Rapid Evolution and the House Sparrow; (6) Environmental Change and Controlling Impacts; and (7) Balancing Human Systems with Natural Processes. Using the red fire ant as a case study, each activity contains a sidebar demonstrating how the red fire ant moves through that particular stage of its own journey, thus helping students connect their general understanding of the science behind introduced species with more specific knowledge about a particular species. Activities also contain background information and suggestions for further study. Contains a resource list. (PVD)