The first sphincter through which food passes is between the ____ and the ____
a. esophagus; stomach
b. pharynx; esophagus
c. stomach; small intestine
d. small intestine; large intestine
e. colon; rectum
ANSWER: a
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You spot your friend Enrique and yell to get his attention, but he can't hear you. As you get closer to him, you clearly hear loud music coming from his headphones. What should you warn him about?
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