The 439 A-Z entries cover biological concepts, the history of science, such critical issues as embryogenesis and the commercial applications of research, ethical issues, and careers in biology, serving as a broad introduction to the many facets of biology. More than 60 entries are brand new and almost three times as many entries are substantially revised and updated; all entries have been reviewed for currency. This edition highlights advances in biology that have taken place since the beginning of the 21st century and topics of contemporary interest, including molecular genetics, biotechnology, human physiology, biodiversity, and ecology. Biographical sidebars feature scientists who have made significant contributions to their fields.
The writing level makes accurate information accessible to a high school audience. Full-color photographs, diagrams, and sidebars add visual interest. More than 600 terms are defined in the margins of the pages where they appear and compiled into a convenient glossary at the back of each volume. Each entry contains a bibliography/suggestions for further reading. A thematic outline provides a guide to entries by subject. Handy references in the front matter include a geologic time scale and metric conversion table.