Flora and fauna in Oklahoma generally are native to one of two geographic regions,

A. Forests or mountains

B. Forests or plains

C. Plains or mountains

D. Mountains or hills

The correct answer is - C. Plains or mountains.

Oklahoma is a state that can be roughly divided into two areas, the plains, and the mountains. The plains occupy the central and eastern part of the state, while the mountains occupy the western part of the state. It is the state that has by far the most ecological regions in the United States, but we can roughly and simply divide the flora and fauna as native to the plains, or native to the mountains.