Explain the difference between local extinction and species extinction.

Local extinction is the disappearence of a species of ONLY a given area. Where as species extinction accounts for all areas. TOTAL extinction.

Hope this helps.

local extinction, is the disappearance of a species only from a given area and species extinction is the extinction of a species everywhere

Explanation:

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.