The following graph shows how the average beak size (depth) in a population of ground finches shifted during particularly wet and particularly dry years. 1977, 1980, 1982 were all drought years, while 1984 was a wet year. 10.5- E 10.0- 9.5- 9.0- 1977 1980 1982 1984 a. Interpret the data. Explain how they relate to natural selection and evolution. b. An observer suggested that during drought years, all the seeds were large and tough to open. This meant that the birds exercised their beaks more, making the beaks stronger. Is this a plausible explanation for the data? Explain your answer. beak depth (mm)

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