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Wheat is now cultivated from the neighbourhood of the equator almost to the borders of the Arctic zone.
The 1_______ of wheat is affected not only by the climate and the soil in which it 2_______, but also by its pedigree; for instance, a weak variety can be grown in a climate and soil that usually produce strong wheats: climate, however, is the predominant factor, as is shown by the fact that wheat repeatedly shown in an unaccustomed 3_______ gradually assumes the characteristics of the 4_______ normally grown in that climate.
quality
grows
climate
wheat