The film features Dr. Michael Nachman, whose work in the field and in the lab has quantified the selective pressure of predators on rock pocket mouse evolution and identified the genes involved in adaptation. This version of the film pauses at three points where students answer questions about the film to assess their understanding of the concepts presented. After completing all quiz modules, students can view and print their answers. The original version of the film, without the embedded assessment, is available to stream or download as well. The video and all materials are also available in Spanish.