According to the principal of dominance, if a recessive gene for tallness is paired with another recessive gene for
talliness, the organism
will be tall
may be tall or short
will be short

. According to the principal of dominance, if a recessive gene for tallness is paired with another recessive gene for tallness, the organism will be tall. By principle, any of two recessive genes will form the characteristic it holds. Dominant genes however only require one to for a trait.

Explanation:

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.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.