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Activities & Tutorials

35.1: Activity: Mutualism in action

This animation provides examples of associations between two species in which both species benefit.

35.2: Activity: Competition in action

Learn how competition can limit the distribution and abundance of species.

35.3: Tutorial: Character displacement

This tutorial explains how intense competition between similar species may cause forms of the competing species evolve to become more different over time.

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About W. W. Norton

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.