Which occurs during digestion? The mouth only allows for physical digestion.
The mouth only allows for chemical digestion.
Chemical digestion prepares the food for physical digestion.
Physical digestion prepares the food for chemical digestion.

Physical digestion prepares the food for chemical digestion.

D

Explanation: Physical digestion prepares the food for chemical digestion.

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.

: -)