Hailed for its clear writing, scientific accuracy, and real-world examples, Essential Biologyis a brief non-majors biology text that focuses on the core concepts readers need to make scientifically informed decisions throughout their lives. The book covers four major topics-cells, genetics, evolution/diversity, and ecology-and uses evolution as an overarching theme to tie all 20 chapters together. Human applications and the most up-to-date information on important issues show readers how biology relates to their own lives. The Third Editionfeatures dynamic new resources designed to focus readers' study time and help them master the most challenging topics in the course. New state-of-the-art eTutor animations and audio MP3 Tutor Sessions guide readers through the most challenging topics in biology. Biology Today. CELLS: Essential Chemistry for Biology, The Molecules of Life, A Tour of the Cell, The Working Cell, Cellular Respiration: Obtaining Energy from Food, Photosynthesis: Using Light to Make Food. GENETICS: Cellular Reproduction: Cells from Cells, Patterns of Inheritance, The Structure and Function of DNA, How Genes are Controlled, DNA Technology. EVOLUTION AND DIVERSITY: How Populations Evolve, How Biological Diversity Evolves, The Evolution of Microbial Life, Plants, Fungi, and the Move onto Land, The Evolution of Animals. ECOLOGY: The Ecology of Organisms and Populations, Communities and Ecosystems, Human Impact on the Environment. For all readers interested in a biology text that focuses on the core concepts readers need to make scientifically informed decisions throughout their lives.