Solids will usually sink when placed in their own liquids. which is an exception?

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;

carbon atoms, hydrogen, oxygen, and nitrogen.