The epiglottis is a
A) muscle that moves the esophagus in line with the pharynx during swallowing.
B) muscle that moves the trachea out of line with the pharynx during swallowing.
C) flap of cartilage that flips down to cover the entry to the trachea during swallowing.
D) sphincter that closes off the entry to the trachea during swallowing.
Answer: C
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