National Park Service Mission the management of Yellowstone from 1872 by way of the early 1900s, which is described in Chapter 1, helped set the stage for the creation of an agency whose sole objective was to manage the national parks. The geographical expansion of identical geno- non because of many other elements that could inuence the pathoge- sorts throughout continents or between continents may have been nicity of a given pressure: other parasitic elements (infectious stage and facilitated by human activities, similar to transportation and human inoculum), the genetic background of the host, and general im- exchanges (223), but also by the migration of birds (262). There are varying degrees of dysplasia (Table 18-2), defned by the diploma of mobile atypia; all types should be noticed and handled if they persist or turn out to be more severe
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