Shоrt Answer Sectiоn (2 pоints eаch): Five questions аre listed below. For full credit, you must аnswer three of the questions. If you choose to answer more than three, you will be given bonus points for each correct additional answer. Describe a vestigial structure and give one example. Name two types of fossils and briefly describe each of them. What is the main difference between vertebrates and invertebrates? Give an example of each category. Briefly describe the concepts of natural selection and descent with modification. What purpose did each concept serve for Darwin’s discoveries? What does it mean when an organism has a complete digestive tract? Name one category (phyla) of an animal that has a complete digestive tract.