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 chapter, you will be able to do the following:

Describe the roles of male and female reproductive hormones
Discuss the interplay of the ovarian and menstrual cycles
Describe the process of menopause

A narrated animation of the process of ovulation. This video shows a simulation of the path an egg takes from the fallopian tubes to the uterus. [1:28]

Learn about the process of ovulation and how it lead to pregnancy in this animated video from the Mayo Clinic. [1:27]