Which of the following is an example of chemical digestion?
A: A whole grape enters your mouth and your teeth break it up into smaller pieces that are easier to swallow.
B: The bagel you ate this morning eventually leaves your body as a waste material called feces.
C: Your body uses the eggs you had for breakfast for energy, growth and healing.
D: Little pieces of chewed up hamburger are broken down into smaller molecules by enzymes.