ALERT: Before you purchase, check with your instructor or review your course syllabus to ensure that you select the correct ISBN. Several versions of Pearson's MyLab & Mastering products exist for each title, including customized versions for individual schools, and registrations are not transferable. In addition, you may need a CourseID, provided by your instructor, to register for and use Pearson's MyLab & Mastering products. Packages Access codes for Pearson's MyLab & Mastering products may not be included when purchasing or renting from companies other than Pearson; check with the seller before completing your purchase. Used or rental books If you rent or purchase a used book with an access code, the access code may have been redeemed previously and you may have to purchase a new access code. Access codes Access codes that are purchased from sellers other than Pearson carry a higher risk of being either the wrong ISBN or a previously redeemed code. Check with the seller prior to purchase. -- With a new open, student-friendly layout and more media integration, the Fourth Edition of Biology of Humans: Concepts, Applications, and Issues continues to personalize the study of human biology. Its conversational writing style, stunning art, abundant applications, and learning tools develop your critical-thinking skills. The authors provide a conceptual framework to help you understand how our bodies work, and to deal with issues relevant to human health in today's world. You'll gain an appreciation for the intricacy of the human body and the place of humans in the ecosphere.