The structure that does have chemical digestion occur should involved the mouth, esophagus, and stomach. hence, the option A is correct.
The molecules that are complex that involved the carbohydrates, proteins, and fats should be transformed via the chemical digestion that should be shifted into the smaller molecules and the same should be absorbed.
Also, After passage by the esophagus, the bolus should enter the stomach and undergo mechanical with respect to chemical digestion.
Learn more about chemical digestion here; https://brainly.com/question/13975812
