Cutting edge biological concepts delivered with a greater emphasis on evolution and a logical use of analogies. This textbook was written from the ground up to be an engaging and accessible learning tool with an emphasis on "how things work and why things happen the way they do." This Essentials textbook features a straightforward, clear writing style and a wide variety of media assets to enhance the content of the textbook. The strength of the second edition is the integration of many tools that are designed to inspire both students and instructors. The multi-media package for the new edition stretches students beyond the confines of the traditional textbook to include high interest video clips and animations of key biological concepts.