What they will see on the chalkboard is the projected image. Students follow along on their own worksheets. You do not need to be an artist to do this activity. rex on a chalkboard over a projected image of a T. rex), may have looked like when it was living. The instructor and students will use the appearance of modern animals to reconstruct what an ancient animal, a Tyrannosaurus rex ( T. The activity reinforces the concept that fossils are mostly the remains of hard parts of ancient life and integrates paleontology with biology. In this activity, students learn how scientists determine what prehistoric animals looked like based on their bones. Core content: Fossils are evidence of past life.