Generally, Separation Costs will be incurred when A. Production levels increase B. Automation Levels increase C. Production Levels decrease D. Production levels decrease and / or Automation levels increase

D

Explanation:

Generally, Separation Costs will be incurred when the production unit is decreased which will adversely decrease the needed compliment.  Separation cost is also incurred when automation leve is increased

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.

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls