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 transferabl...e. In addition, you may need a CourseID, provided by your instructor, to register for and use Pearson's MyLab & Mastering products. Student can use the URL and phone number below to help answer their questions: http://247pearsoned.custhelp.com/app/home 800-677-6337 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. 0321932838 / 9780321932839 Campbell Biology in Focus & Modified MasteringBiology with Pearson eText -- Access Card Package Package consists of: 0321813804 / 9780321813800 Campbell Biology in Focus 0321903331 / 9780321903334 Modified MasteringBiology with Pearson eText -- ValuePack Access Card -- for Campbell Biology in Focus