This document serves as a teaching guide for the third of three seminars in a unit on biodiversity. This seminar focuses on invasive species in order to underscore the difficulties of managing and restoring ecosystems and the potential damage of intended or unintended manipulation. As explained in the corresponding lecture, biodiversity theory can explain the causes and consequences of biodiversity loss and provides recommendations for mediating the sixth global extinction event and thus ensuring the availability of ecosystem services, the health of the biosphere, and the quality of human life. The guide includes an overview, reading list, and step-by-step seminar plan, including suggested discussion questions, activities, and reference to assignments. Related seminar activities and assignment questions are provided in accompanying files.