Organize

1. Follow this Study Plan to access your chapter assignments.
2. Master the key terms for this chapter by working through the deck of Flashcards.

Learn

1. Read Chapter 4 in your textbook or ebook.
2. Study the Animations for this chapter.
3. Take What's News Quizzes to learn about relevant news stories and apply classroom lessons to daily life.
4. Access Quiz+! The results of this chapter quiz create a Custom Study Plan that links you directly to materials that will assist your pre-exam review.
5. Take Visual Quizzes test your knowledge of the figures, charts, and diagrams in the text.
6. Use Audio Glossary to look up important terms with audio pronunciations.

Connect

1. Stay updated with Biology in the News.

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W. W. Norton & Company has been independent since its founding in 1923, when William Warder Norton and Margaret D. Norton first published lectures delivered at the People's Institute, the adult education division of New York City's Cooper Union. The Nortons soon expanded their program beyond the Institute, publishing books by celebrated academics from America and abroad. By mid-century, the two major pillars of Norton's publishing program—trade books and college texts—were firmly established. In the 1950s, the Norton family transferred control of the company to its employees, and today—with a staff of 400 and a comparable number of trade, college, and professional titles published each year—W. W. Norton & Company stands as the largest and oldest publishing house owned wholly by its employees.