Alot of people use it to get hig.. by taking oraly
Answer:
the esophageal sphincter
Explanation:
This muscle opens and lets food and liquid enter the stomach and closes to prevent the food and liquid from leaking back into the esophagus, however if it is not working properly it could open and close at the wrong times
<span>a morbidity survey of the general population, like the national health interview survey</span>
The answer is Twice a year
I think because so they can stay healthy for while
