The table shows the doubling time of the world’s population throughout history. the table shows the doubling time of the world’s population throughout history. worldwide, the doubling time of the human population is about 30 to 40 months 7 to 10 years 40 to 50 years 100 to 150 years

It would 100% be 40 to 50 years old.

The answer would be 40 to 50 years.

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.