Why do you think that dilating blood vessels will decrease temperature of the blood as well as decrease blood pressure?

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

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.

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