homologous structures uniformity analogous structures natural selection e. measured by reproductive success f. insect wing and bird wing g. survival of the fittest h. characteristic of radioisotope 11. Match the person with the correct description. Charles Darwin Jean-Baptiste Lamarck Alfred Wallace Georges Curvier Thomas Malthus a. Naturalist who entertained the idea of common ancestry b. Proposed that many species had become extinct c. Believed species become more perfect over time d. Individuals of a population must compete w/each other e. Individuals in a natural population vary in fitness 12. What are the steps involved in fossilization? 1. 3. 4. 13. Master genes calledsculpt details of body forms during embryonic development. 14. A mass extinction occurred 65.5 million years ago, and the event is marked by an unusual, worldwide layer of rock called the K-T boundary. Many scientists believe that the extinction was caused by the impact of a large asteroid hitting Earth, resulting in the permanent loss of major groups of organisms, including the dinosaurs. Some scientists believe we currently have entered a sixth mass extinction period in which many species’ populations are shrinking rapidly. This extinction isn’t being driven by the impact of an asteroid, so what do you think some of the causes could be for the large loss these species’ populations? (Use complete sentences. Worth 25 points.)