The cordilleran flycatcher and pacific-slope flycatcher were once thought to be the same species, but they are now known to be different species because they have different common names they don't look the same they have different diets they do not interbreed

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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.