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                In areas of the American Wheat Belt and American Corn Belt in the midwest, certain insect species are quickly becoming resistant to continuous application of specific chemical insecticides. The increase in the number of insecticide-resistant insects is due to
natural selection
variability through asexual reproduction
inheritance of acquired traits
geographic isolation
            
        natural selection
variability through asexual reproduction
inheritance of acquired traits
geographic isolation
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    natural selection
    
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