Concept:Villi increase the surface area of the small intestine for absorbing digested nutrients into the blood.
Explanation:The small intestine is the main site where digested food is absorbed.
Villi are tiny finger-like projections lining its inner wall.
Their large surface area helps absorb digested nutrients such as sugars, amino acids, and fats.
Digestion itself is carried out by enzymes secreted into the intestine, not by villi.
If villi are absent, the surface area for absorption becomes very small.
Therefore, the organism will face difficulty in absorbing nutrients.
Water absorption mainly occurs in the large intestine, not through villi.
Answer:C. absorption of nutrients only