Read the Following Scenario and Answer the Question Below

Read the following scenario and answer the question below.
The western United States contains a series of tall mountain ranges that also extend far down into Mexico. The largest of these ranges are the Rockies and the Sierra Madres, but they are all part of the same mountain- building event that occurred many millions of years ago, and they all have similar features. Much of the vegetation on these mountaintops is the same, or very similar, and they are often referred to as the "Sky Islands" because of their similarity to each other and their isolation from the lower, drier areas surrounding them.
-The tendency of humans to want to live in these Sky Islands, visit them for recreation, and use them for lumber or for wood pulp, causes _______________

A) increased biomass
B) decreased extirpation
C) increased genetic diversity
D) increased habitat fragmentation
E) increased ecosystem diversity