5.This structure is responsible for contact digestion
a. mouth
b. gastric pits
c. microvilli
d. intestinal crypts
e. lacteals

i'm gonna say mouth

Explanation:

when food comes in contact with the brush border it begins digestion

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.