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…showed last 75 words of 368 total…beetles. This can cause a shortage of food for insect eating birds. Pesticides are poisonous and can pass on to animals higher up in the food chain and sometimes humans. Fertilizers. Fertilizers contain nitrates, which are essential to the growing of a plant. Without them crops wouldn't grow nearly as well. Crops take nitrates from the soil and nitrates need to be replaced. If the fertilizer flows into streams or lakes the result is eutrophication.