White spotting, or piebald trait, characterized by an absence of hair pigment in specific places, is caused by mutant copies of a a) carbohydrate. b) gene. c) lipid. d) steroid

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

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.

: -)