What is the equation used to determine the mechanical advantage of a wedge? 1. MA = width - length
2. MA = width + length
3. MA = width * length
4. MA = length / width

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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.

the answer is b.) hydrogen bonds between bases.