This program uses vivid live-action photography and computer generated animation to survey and explore evolution through natural selection. Viewers explore these four aspects of natural selection: variation in genes, the results of environmental pressure, best-adapted individuals and the passing of genes to future generations. Video narration and animation helps students to develop a concrete grasp on an abstract concept. As the video provides numerous real-life examples, students will gain an understanding of the key concepts and processes involved in natural selection. Through detailed explanations, viewers are able to see how certain factors affect the frequency of alleles in a population, such as genetic drift, bottleneck and founder effect. The video also discusses divergent, convergent and parallel evolution as well as fossil dating methods. This program and its accompanying Teacher's Resource Book serve as useful tools for helping students understand why species evolve, how natural selection works, and the role that certain factors play in determining the survival of a species.