The parents of a child with cystic fibrosis ask the nurse to explain the sweat test performed on their newborn. how should the nurse respond?

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.

"do a testcross with a homozygous recessive plant."