Why do finches on one island have long and thin beaks while finches on another island have short and thick beaks?

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Read Leban chapter 2 HERE

 

What is the three part method for explaining the difference in beaks?

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What are cooperation problems?  How can we solve them?

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What is the general cooperation problem humans have faced since our earliest evolutionary history?

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What trait/behavior does Leban think we evolved to solve this problem?

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