Describe the similarities and differences between the bones found in the owl pellets.

Explanation:

Look under trees, especially evergreen trees, for "whitewash" (poop) and pellets. Owls can be creatures of habit, so if you find one, you may find many more in the same area. CAUTION: Make sure that what you are picking up is indeed an owl pellet and not scat (poop) from a mammal.

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.