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19. Compared to the author of Passage A, the author of Passage B provides more information about the:
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A. reduction in the number of apple varieties in North America over the past four centuries.
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B. methods Vavilov used to prove to other scientists that the apples growing in the Tian Shan are the ancestors of the modern apple.
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C. number of apple varieties that are thriving in Kazakhstan today.
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D. techniques used by researchers to determine the regions with the greatest genetic diversity in plants.