This learning resource is designed to help students classify crime scene evidence into two distinct categories: biological and physical. The objective is for students to accurately identify and describe evidence based on whether it originates from living sources (biological) or non-living materials (physical). The resource includes various activities that guide students in sorting items like leaves, soil, glass, and metal into appropriate classifications. Each activity encourages them to articulate the origins of these materials and compare their composition, enhancing their understanding of the characteristics that define biological versus physical evidence. Additionally, students are challenged to think critically about how different conditions can influence the classification of evidence.