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 distinguishing characteristics of echinoderms
Describe the distinguishing characteristics of chordates

The five-part symmetry of echinoderms is demonstrated, as the five-armed starfish is morphed into an urchin that is then morphed into a sea cucumber. [1:42]

An exciting explanation of animal development using sea urchins as a model. Animations, still images and supporting explanations make for a great learning experience.

See sea urchins as they develop. A complete set of instructions for a lab in developmental biology. Excellent supporting material is provided, including troubleshooting information.

A fantastic set of lab exercises, background information, teaching materials and references. Great for high school biology.