The domain is made up of prokaryotes that usually have a cell wall and the at usually reproduce by cell division.

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.

: -)

the electromagnetic energy from the sun arrives in the form of visible and invisible light.

the fossil record provides evidence of a common ancestor to many species.