Which of the following best describes an igneous rock that formed from quickly cooling lava?

answer; ///(b) it is composed of four protein chains and four heme groups;

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.

: -)

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

i think its y= -4x-14