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scientists found that cyanide production tended to increase with distance from the center of cities, suggesting that clover populations were adapting to factors commonly found in urban centers worldwide. Possible factors could include temperature (freezing is related to cyanide content), herbivory pressures, and drought stress. The research suggests that the downtowns of cities such as Boston may more closely resemble far-flung cities such as Beijing as clover habitats than they

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