Help students analyze real anatomical evidence for evolution using this guided comparative anatomy investigation focused on forelimb structures, homologous vs. analogous traits, vestigial structures, cladograms, and CER writing. In this activity, students compare the forelimb bones of six vertebrates—human, dog, horse, bat, bird, and seal—to determine evolutionary relationships and construct a scientific explanation for common ancestry. This resource is designed to:Build evidence-based reasoning