the gastrointestinal system
The intestines belong to the Digestive Tract (or Digestive System.) Fact: Stretched from end to end, the human intestines would stretch a mile, literally!
The digestive system.
the intestines are in the digestive system.
Polio multiplies in the intestines and invades the central nervous system.
Digestive System
The digestive system.
The animal is an organism. The intestines are a system.
Digestive system
digestive system
yes crabs do have intestines because in order for them to have a digestive system you need intestines to help digest foods
intestines: Digestive system lungs: Respiratory system
The digestive system.