THE SCIENCE OF AGRICULTURE: A BIOLOGICAL APPROACH, 4th EDITION integrates biological sciences with modern agricultural concepts. Easy-to-follow and superbly illustrated, this text will develop the reader's comprehension of Agriscience, as thorough coverage is given to plant and animal systems, soils, cell functions, genetics, genetic engineering, plant and animal reproduction, entomology, the uses of biotechnology, environmental concerns as well as new direction in agriculture and careers. The text also includes an examination of the controversy and concerns over the use of genetic engineering, genetically modified organisms, cloning, and their perceived and potential dangers to humans and the environment. An emphasis is placed on critical thinking, and practical activities to reinforce key information are featured at the end of each chapter. New directions in agriculture and agricultural career choices for the 21st century are also considered.