The digestive system.
The digestive system contains the small intestine. It is a vital organ for nutrient absorption in the body.
The digestive system
The organ that contains the villi is the small intestine.
The small intestine is part of the gastrointestinal system
Digestive System.
its part of the digestive system
The small intestine.
The organ system, since the small intestine is extremely big
it belongs to the digestive system
It's an organ. The organ system it belongs to is the digestive system, and it is made up of several types of tissues (epithelial, muscle, etc.), so it can't be a system or tissue in itself.
stomach,duodenum, mouth,small intestine, large intestine
Small intestine