To keep out dirt and other bad things
<span>D-make sure that you inform parents ahead of time so that they can plan on attending</span>
national, environmental, professional, and social
There are several sphincters that appear along the gastrointestinal tract in the human body. The sphincters are; upper esophageal, lower esophageal, pyloric, ileocaecal, and the inner and outer anal sphincters.
