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A highly-paid research scientist works 12 hours a day, while a common laborer works only 5 hours a day. Offer a likely explanation, using the concept of opportunity cost.
Lower Esophageal Sphincter
A muscular ring at the lower end of the esophagus that controls the flow of food from the esophagus into the stomach.
Alimentary Canal
The digestive tube extending from the mouth to the anus, through which food is ingested, digested, absorbed, and waste material expelled.
Amylase
An enzyme that catalyzes the hydrolysis of starch into sugars, found in the saliva and pancreatic fluid of humans.
Starch
A carbohydrate consisting of a large number of glucose units, serving as a major energy source from food.
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