CHALLENGE (EVALUATION)
Underline the correct word in the parentheses to complete the process of digestion.

Digestion starts in the (mouth, stomach). The starch is converted into (salt, sugar)
with the action of (pepsin, ptyalin). Food from the (mouth, stomach) goes down to a long
tube called (intestine, esophagus) to the (stomach, large intestine). Food from the stomach
goes to the (small intestine, large intestine) for final digestion. Then it goes farther into the
(small intestine, large intestine). Waste product of digestion is excreted through the
(appendix, rectum).​