Answer:
A) endemic
Explanation:
Mojave desert is the most driest desert present in North America, as the area is very hot and dry so the flora of that area has adapted to the hot environment, Joshua tree is the endemic species of that region, it exists only in that particular geographic region.
Endemic species are those species of plants and animals that is present in that particular geographic region, a species can be endemic to a continent or a part of continent, means endemic to small or large area. Joshua tree is in the same manner endemic to Mojave desert with somehow restricted distribution.
