This could involve small and large mammals, birds, insects, reptiles, or plants. Procedures and work sheets are suggested to evaluate competition. The fourth section deals with hybridization. Selection pressures are evaluated as to how allele frequency can be controlled in a population and how to study population genetics. In the fifth activity, rapid evolution is illustrated by examining the house sparrow.
Environmental change is featured in the sixth activity in which water hyacinth is studied.
At the end, there is a student evaluation sheet. The authors set up the studies, estimate the time for completion of the study, describe ways of organizing studies as individuals or as teams, provide sample data sheets, list materials needed for the activity, and suggest discussion of the conclusions reached. The activities are doable and supplement subject matter study especially in biology, and are illustrated by limited but appropriate drawings or photos. The emphasis is on observation of nature and how to classify organisms as to their role in nature and their relation to humankind, instead of relying on text books. This is a useful workbook to supplement traditional textbooks.