Sediment laid down by glacial meltwater is called

a glacial erratic
stratified drift
ground moraine
an outwash plain

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.

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.