12. salt balance comes through secretion of
a. glucagon.
b. prolactin.
c. acth.
d. aldosterone.

i believe the answer is c

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.

: -)

burning fossil fouls really decrease the carbon in the atmosphere so b