Eve and Frank own twenty acres of land on which there is a warehouse (answer attached)

1A. Eve and Frank own twenty acres of land on which there is a warehouse surrounded by a fence. What is the most important factor in determining whether the fence is a fixture?

2A.         Sam owns an acre of land on Red River. The government dams the river. A lake forms behind the dam, covering Sam’s land. Does the government owe Sam anything? If so, what? If not, why?