Note: If you are purchasing an electronic version, MasteringBiology does not automatically come packaged with it. To purchase MasteringBiology, please visit www.masteringbiology.com, or you can purchase a package of the physical text and MasteringBiology by searching for ISBN 10: 032191158X / ISBN 13: 9780321911582. Campbell BIOLOGY is the best-selling introductory biology text in Canada. The text is written for university biology majors and is unparalleled with respect to its accuracy, depth of explanation, and art program, as well as its overall effectiveness as a teaching and learning tool.