题目内容

Crop genetic diversity might decrease due to the development of superior GM strains that crowd others out of the market. The actual effect on biodiversity is _____________.

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Introduced traits in GM crops potentially can cross into neighboring plants of the same or closely related species through three different types of gene flow: crop-to-crop, crop-to-weedy, and ________________.

A 2010 study showed that about ______ of wild or weedy canola tested contained genetically modified herbicide resistance genes.

Research concluded that adoption of GM technology had reduced chemical pesticide use by ______, with the effect larger for insect-tolerant crops than herbicide-tolerant crops.

Potential environmental effects of genetically modified crops include gene flow, pesticide resistance and ___________________________.