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GRE Sentence Completion questions

For each blank select one entry from the corresponding column of choices. Fill all blanks in the way that best completes the text.

In this study we investigated MHC evolution in two recently diverged bird species: the __________ Galapagos hawk (Buteo galapagoensis), which occurs in small, isolated island populations, and its widespread mainland relative, the Swainson's hawk (B. ...

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