g Events that create genetic variation in a population can occur at a molecular level, by or at a population level by .

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.

: -)

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.