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Question
A species of bird had an original range covering the entire eastern half of the United States from New England west to the Mississippi and then south to Florida. During a period of glaciation, the eastern part of the population was cut off from the western part for 2000 years. Then the glacier melted and the birds' range was re-established. During the separation, the western birds evolved a slightly different song and a darker wing colour. Ornithologists are now studying this species to determine whether speciation has taken place. What evidence will they look for in their study?Answer
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