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15-1 Section Assessment: The Puzzle of Life’s Diversity 1. 2. 3. 4. 5. What did Darwin’s travels reveal to him about the number and variety of living species? How did tortoises and birds differ among the islands of the Galapagos? What is evolution? Why is evolution referred to as a theory? What is a fossil? Darwin found fossils of many organisms that were different from any living species. How would this finding have affected his understanding of life’s diversity? 15-2 Section Assessment: Ideas That Shaped Darwin’s Thinking 1. 2. 3. 4. 5. What two ideas from geology were important to Darwin’s thinking? According to Lamarck, how did organisms acquire traits? According to Malthus, what factors limited population growth? How did Lyell’ Principles of Geology influence Darwin? Imagine that you are Thomas Malthus. Write an article describing your ideas. Explain the impact of a growing population on society and the environment.3 15-3 Section Assessment: Darwin Presents His Case 1. How is artificial selection dependent on variation in nature? 2. The theory of evolution by natural selection explains, in scientific terms, how living things evolve over time. What is being selected in this process? 3. What types of evidence did Darwin use to support his theory of change over time? 4. Use scientific evidence to evaluate Darwin’s theory of evolution by natural selection.