NAD Pathways Grade 8 selection for theme 6: Environment. In this book, wildlife biologist Susan Quinlan presents a number of questions or mysteries concerning plants and animals in the tropical forests of South and Central America and explains how scientists answered those questions. Each chapter presents another mystery with the observations and clear thinking that resulted in its solution. The author's drawings, washed with gray, illustrate the text. A chapter-by-chapter bibliography of sources, mainly studies reported in scientific journals, is appended. An intriguing introduction to the process of scientific study and to the interconnected plants and animals of tropical forests.