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Urban foresters recognize that species diversification is essential to safeguarding the urban forest and the benefits it provides. However, increasing the diversity of the urban forest does more than just improve resilience to pests. More diverse trees and plants also provide habitat for more diverse bacteria and fungi. This is important, because exposure to these microbes can stimulate the human immune system, leading to surprising health benefits for the people who live among them. (A, U, M, Bm, Bs)
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