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While visiting the Galapagos Islands in 1835, Charles Darwin collected over thirteen different species of a type of bird called a finch. He later observed that the birds were similar in many ways but often differed in the size and shape of their beaks. Which statement BEST summarizes Darwin's explanantion for the different beaks he observed in these finch species?

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waterhorse800
The finches had all descended from a common ancestor but their beaks had changed over time as the ones that were better at eating the food on their islands ate more food and were more likely to survive and pass on their superior beak to their offspring.
bluenite2002
the beak of each finch species is a result of natural selection. 

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