The most cells of the human body are responsible for A Defense B reproduction C removing waste D providing energy

Providing energy is the most likely answer

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.

: -)

yes? sounds right, but you didn’t ask a question.