Final answer:
No, Teddy Roosevelt has not adversely possessed a portion of the national park.
Step-by-step explanation:
No, Teddy Roosevelt has not adversely possessed a portion of the national park. Adverse possession refers to a legal principle where someone can gain ownership of another person's property by using it in an open, continuous, and adverse manner for a specific period of time, typically ranging from 10 to 20 years. However, public land, such as a national park, generally cannot be subjected to adverse possession because it is dedicated for public use and cannot be privately owned. Therefore, Teddy Roosevelt cannot claim ownership of the portion of the park where his guest house sits.