Imagine you were the manager of a national park with cheetahs. The cheetahs feed primarily on gazelles while the gazelles eat grass. It takes an acre of grassland to feed one gazelle and it takes ten gazelles to feed one cheetah. You have a maximum of ten cheetahs when the system is functioning optimally. You would like to increase the cheetah population because people pay money to see the cheetahs. How much more grassland do you need in order to double the cheetah population?
A) 200 acres
B) 10 acres
C) 500 acres
D) 100 acres

D) 100 acres

Explanation:

gazelles typically frequent wide open plains and space where they browse on grasses shoots and leaves. open plains make them visible to predators such as cheetah or wild dogs but gazelles are fleet of foots. the Thomson's gazelles can reach a speed of 40 miles an hour. some gazelles population eschew the grasslands for mountainous landscape or even deserts. during the dry season some grassland gazelles will even take to the bush of africa in search of water

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.