What is the relationship between genes, traits and proteins?

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

i think the answer would be a. after sentence 14! i hope i at least a little

barometer is an instrument used to measure the atmosphere's pressure. the high air pressure relative to average levels is associated with calm and sunny weather. on the other hand, low pressure is associated with bad weather, high winds, and rain. 

i think your answer is a. it splits a cell into two new daughter cells. the others don't really make sense to me so i would go with that one.