Which is true ? a. all organisms obtain water through food b. some substances must be dissolved in water before they can be used c. water s important to some organisms d. plant cells are unaffected when water is scarce

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.

the answer would be knowledge about cars!