1. Does Natural Selection act on Phenotypes or Genotypes? http://fig.cox.miami.edu/cmallery/150/unity/c1x17b-finches.jpg

3. Individuals within a population vary in their traits: Fig Figure 1: Histogram of distribution of beak depth of medium ground finches on Daphne Major, before and after the drought of 1977 (Grant 1986). Reprinted by permission of Princeton University Press. http://fig.cox.miami.edu/cmallery/iso/unity/case_study.htm

6. Individuals with advantageous traits will survive and reproduce: Figure 1: Histogram of distribution of beak depth of medium ground finches on Daphne Major, before and after the drought of 1977 (Grant 1986). Reprinted by permission of Princeton University Press. http://fig.cox.miami.edu/cmallery/iso/unity/case_study.htm