Final answer:
Microvilli are the structures in the small intestine that absorb nutrients, including fats.
Step-by-step explanation:
The structure in the small intestine that absorbs nutrients is the microvilli. Microvilli are finger-like projections on the surface of the cells lining the small intestine. These projections increase the surface area of the intestine, allowing for more efficient absorption of nutrients from digested food.
For example, microvilli absorb and transport fats, as well as other nutrients, into the bloodstream for distribution to the rest of the body.