What can we do (or not do) to help keep these relationships among plants and animals healthy?

PLEASE HELP

hello there the answer is d

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 correct answer to this question is #5

the answer you are looking for is the united states forest service.

hope this !