Biology 2e is designed to cover the scope and sequence requirements of a typical two-semester biology course for science majors. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology includes rich features that engage students in scientific inquiry, highlight careers in the biological sciences, and offer everyday applications. The book also includes various types of practice and homework questions that help students understand—and apply—key concepts. The 2nd edition has been revised to incorporate clearer, more current, and more dynamic explanations, while maintaining the same organization as the first edition. Art and illustrations have been substantially improved, and the textbook features additional assessments and related resources.

By the end of this section, you will be able to do the following:

Describe the difference between jawless and jawed fishes
Discuss the distinguishing features of sharks and rays compared to other modern fishes

In the animal kingdom, there are seven living classes in the phylum Vertebrata. The Palomar College shares detailed information on each of these classes. Includes examples and photos as well as a follow-up quiz.