Wildlife represents the uncultivated or undomesticated species. They have a wide gene pool. The cultivated plants and domesticated animals have a narrow gene pool because these organisms have been selected by man over a period of thousands of year. Further, the cultivated plants and domesticated animals grow in protected environments. The uncultivated plants and nondomesticated animals, on the other hand, grow in natural surroundings in conjunction with disease-causing organisms and depend on the naturally evolved defense mechanisms. These organisms have evolved disease resistance, mechanisms and are a rich source of disease resistance germplasm.
Therefore, the correct answer is option D.
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