Figure 12.2 Color Used for Emphasis

Source: From W. K. Purves, D. Sadava, G. H. Orians, and H. C. Heller, LIFE: THE SCIENCE OF BIOLOGY, Seventh Edition, Page 560. Copyright 2004. Reprinted by permission of Sinauer Associates, Inc.

Source: Bonneville, 2009: www.bpa.gov/FinancialInformation/Annual reports/Documents/AR2009.pdf