This program illustrates the collecting of seemingly ordinary rocks in the field and how these rocks can reveal important information when subjected to careful laboratory analysis; analyzes fossilized plant remains and determines their origin; presents evidence provided by structural analysis, which supports the theory of evolution of land plants from the simple to the more complex; explains the relationship between the structures of extant plant forms and early plant groups that may have been their ancestors; and demonstrates the processes used to reconstruct the original form of early animals. After viewing the program, students should understand in general how a modern paleontologist works in a well-equipped laboratory and, more specifically, the significance of the structural details revealed in the lab. (20 minutes, color)