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Monoculture farming means that on a given area of agricultural land only one type of crop is grown (eg trees for palm oil grown in Indonesian rainforest) This large scale growth of a single variety of plant does not happen naturally in ecosystems, where there are usually many different species of plants growing which, in turn, support many species of animals (high biodiversity) In monocultures, biodiversity is much lower Another issue with monocultures is the increase在害虫种群中 - 如果特定的害虫以农作物为食，在大面积上耕种，这意味着有大量的害虫供应食物，导致种群增加，农民经常将杀虫剂喷到农作物上以控制害虫。这导致：
疾病和免疫力
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