Can you think of a situation in which the medium ground finches would have a survival advantage over the cactus finches? What physical trait varies the most between the cactus finch and the medium ground finch? What is the most common beak depth of the finches living on Daphne Major in 1976? causing them to decrease in numbers. Many years ago, a small population of a single bird species migrated to the islands and evolved into the 13 species that live on the islands today. The Methodology of the Social Sciences (Max Weber), Forecasting, Time Series, and Regression (Richard T. O'Connell; Anne B. Koehler), Campbell Biology (Jane B. Reece; Lisa A. Urry; Michael L. Cain; Steven A. Wasserman; Peter V. Minorsky), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Chemistry: The Central Science (Theodore E. Brown; H. Eugene H LeMay; Bruce E. 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Explain why the Grants concluded that beak depth may have played a more important role in survival during the drought than wing length or body mass. Grouping species according to shared characteristics can provide clues to how they have evolved. What are the two different theories as to why there are 13 different species of finches on the islands? The birds with a beak depth that was better at eating the larger seeds on the island (larger beak) What evidence did scientists use to determine that the 13 species of finches on the Galapagos arose from a single common ancestor? a visual representation of sound frequencies over time. There appears to be 3 birds with a beak depth of 8 remaining after the drought. from breeding with members of other species? Write. population to change over time with respect to wing symmetry? The Galpagos islands are considered to be "young" islands. Was the Galpagos ever connected to the mainland? How far are the Galpagos from Ecuador in mainland S. 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