The digestive tract begins at the mouth, where the teeth and tongue begin the breakdown of food, aided by saliva.
(The digestive tract; begins; L:at the mouth; T:where the teeth and tongue begin the breakdown of food) (the teeth and tongue; begin; the breakdown of food, aided by saliva) (the breakdown of food; aided; by saliva)
The digestive tract the teeth and tongue the breakdown of food
begins begin aided
L:at the mouth T:where the teeth and tongue begin the breakdown of food
the breakdown of food, aided by saliva
by saliva