How does adaptation effect the diversity of a species?

Adaptations generally occur in order to increase the fitness and thus survival of organisms. ... shown that may not be sufficient to accurately predict the effects of climate change on a species.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.