1b. The reason Figure C is the best histogram for birds that survived is because Bumpus had suggested that birds that were unusually large or small were unable to survive the winter due to a natural selection he called, stabilizing selection. According to Bumpus, stabilizing selection "winnows out of the extremes and favors those in the middle..", supporting that the there is a relationship between the size of the birds' traits and their survival. Figure C shows the best representation of the living sparrows because of the high frequency of the 'average' trait.
2. The example of the birds is related to the understanding of influenza because both undergo the process of stabilizing selection. Viruses that produce genetic very