people start to puke
Whichever one you place there.
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The lips.
Food begins to break down as soon as it enters your mouth.
As soon as the food or drink enters your mouth
Nutrition Science
the definition of mouth is opening through which food enters the digestive system of an organism
Food such as soil enters the earthworm's mouth where it is swallowed by the pharynx.
Food enters through the mouth at the end of the peristome and is pinched off into food vacuoles.
Teeth begin to chew and break down food upon this food enters the mouth. As they break down the food for easier absorption and digestion, human salivary glands become activated and make the food wet and mash-able, which makes swallowing easier.
mouth (oesophagus)
That would be the alimentary canal. Food enters the mouth, then travels down the esophagus to the stomach. From there it enters the intestines and exits through the anus as feces.
Salivary Glands