Place the organisms from the chesapeake bay ecosystem below on the food chain bald eagle , bay grasses , crab larvae , anchovy , rock fish name which is top and bottom on the food chain

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.