Question

chemical digestion begins in the ______ .
a mouth
b esophagus
c stomach
d small intestine

Explanation:

Chemical digestion involves enzymes breaking down food. In the mouth, saliva contains amylase that starts breaking down starches, so chemical digestion begins here. The esophagus only transports food, the stomach starts protein digestion (but after mouth's start), and small intestine continues digestion. So the correct option is A.

Answer:

A. mouth