Practice 2 Answer the following questions on the distribution of traits caused by natural selection. Darken the circle
that corresponds to your answer choice.
1. In a tropical habitat, a variety of hummingbird species use their bills to feed on flower nectar. If a population of
hummingbirds enters a new habitat with an abundance of trumpet vine plants that have longer flowers, those
individuals with slightly longer bills will be favored in the new environment. Those hummingbirds with
medium-length and shorter bills are less successful. Which type of natural selection is at work in this example?
stabilizing selection ® disruptive selection © directional selection O bilateral selection

Ms. w, a 21-year-old woman, came into a clinic after suffering a deep laceration on her foot while walking barefoot around her yard. the wound was cleaned, sutured, and bandaged, and she was released to return home after receiving tetanus antitoxoid. within 72 hours, the wound area was red and swollen, the suture line was dark in color, and it was accompanied by severe throbbing pain. ms. w had a high fever, her heart felt like it was racing, and she was finding it hard to concentraten even on simple tasks. she returned to the clinic and was immediately taken to the hospital. following lab tests, a diagnosis of acute necrotizing fasciitis was made. discussion questions 1. explain why ms. w. received a tetanus antitoxoid before leaving the hospital. (see chapters 3 and 4, infection and passive immunity.) 2. explain how acute necrotizing fasciitis developed in this case and the pathophysiology involved. (see acute necrotizing fasciitis.) 3. what is the potential outcome for ms. w if antibiotic drugs do not reduce the infection quickly?