Ascientific theory states that the universe is expanding. which of these statements is correct about this theory?
it is a fact which cannot change over time.
it is strengthened by data which is always contradictory.
it will become a law if it is supported by scientific evidence.
it is a well supported explanation which cannot become a law

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.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.