This updated classroom review book covers all topics prescribed by the New York State Board of Regents in two comprehensive study units. Unit One explains the process of scientific inquiry, including the understanding of natural phenomena and laboratory testing in biology. Unit Two deals with understanding and application of scientific concepts, with specific focus on cell function and structure, the chemistry of living organisms, genetic continuity, the interdependence of living things, the human impact on ecosystems, and several other pertinent topics. Two recent Regents exams are presented with all questions answered. The bookas added features include glossaries of prominent scientists and biological terms. In this new edition, teachers will appreciate the addition of "Essential Questions " to assist them in developing standards-based learning units and curriculum maps at the local level.