Digestive tract is responsible to transport food into the body to be nourished body digestive system does not exist. The body was unable to absorb nutrients and unable to sustain a living.
Gastroenterology is responsible for transporting food into the body to nourish the body without the digestive system. Our body can not absorb nutrients. And can not survive.
The digestive tract is transporting food into the body to nourish the body if there is no digestive system. The body cannot absorb nutrients. And can't live without it.