A number of changes and improvements have been made to this edition. Based on comments from users of the seventh edition and reviewers" suggestions, a major effort was made to increase the emphasis on conceptual understanding, to add new end-of-chapter questions and problems that are informed by research, and to improve the clarity of the presentation. The new pedagogical features added to this edition are based on current trends in science education. The following represent the major changes in the eighth edition. Формат: 21,5 см x 27,5 см.