Are humans predators in their ecosystem? explain

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah

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.