"1.look at figure 30-1. in which structure is water extracted for digestive food?
a. b
b. d
c. g
d. h

2. where does the process of chemical digestion begin?
a. stomach
b. esophagus
c. small intestine
d. mouth

3.what is the purpose of villi in the small intestine?
a. to neutralise stomach acid
b. to break down protein into amino acids
c. to sweep food out of the small intestines and into large intestines
d. to increase the surface area through which nutrients can be absorbed"