what is the pharynx and where is it located
Pharynx The pharynx (plural: pharynges) is the part of the throat that is behind the mouth and nasal cavity and above the esophagus and the larynx, or the tubes going down to the stomach and the lungs. The pharynx is an area found in vertebrates and invertebrates, though the structure is not universally the same across all of those species.
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
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Vein Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.