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:

Name and describe the distinguishing features of the three main groups of mammals
Describe the likely line of evolutionary descent that produced mammals
List some derived features that may have arisen in response to mammals’ need for constant, high-level metabolism
Identify the major clades of eutherian mammals

This resource provides detailed information about the warthog, as well as several pictures.

This episode of the Kratt brothers has them interacting with kangaroos after a joey steals their car keys. They learn about the differences between humans and kangaroos, and discover how powerful kangaroo feet are and the role they play in establishing male dominance in a group. [26:26]