The ileum contains ________ that project into the lumen and increase the amount of surface area.
A. haustra
B. rugae
C. enzymes
D. villi
Answer:D
The ileum contains ________ that project into the lumen and increase the amount of surface area.
A. haustra B. rugae C. enzymes D. villi
Explanation: A) Haustra are in the large intestine.