The following questions refer to the figure below of a midsagittal, T2-weighted MRI of the neck. 
-Which arrow points to the esophagus?
Definitions:
Chlorofluorocarbons (CFCs)
Man-made chemical compounds once used in air conditioning, refrigeration, and aerosol propellants, known to deplete the ozone layer.
Propellants
Substances that are used to propel an object by generating a gas under pressure.
Sea Levels
The average height of the ocean's surface, used as a baseline in measuring land elevation and ocean depth.
Wet Deposition
The process by which pollutants are removed from the atmosphere and deposited on the Earth's surface via precipitation, like rain or snow.
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