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Starting from the wild mustard Brassica oleracea, breeders have created the strains known as Brussels sprouts, broccoli, kale, and cabbage. Which of the following statements is correct with regard to the wild mustard?A) there is enough heritable variation in the wild mustard to permit these different varietiesB) heritable variation is low in wild mustard--otherwise this wild strain would have different characteristicsC) natural selection is rare in wild populations of wild mustardD) in wild mustard, most of the variation is due to differences in soil or of the aspects of the environment

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