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The mucus layer in the stomach is secreted by specialized cells called goblet cells. It is important for protecting the stomach lining from the acidic digestive juices and enzymes produced in the stomach. The mucus layer acts as a physical barrier that helps prevent damage to the stomach tissue.
The size of kidneys don't usually decrease in size over time.
Ozone is likely to decrease at poles. Mostly at Antarctica.
A hypothesis could be: "A decrease in the ozone layer leads to increased ultraviolet radiation exposure in Antarctica, which negatively impacts the food sources of penguins, ultimately reducing their population size."
The layer of the GI tract that functions by secreting a lubricating fluid is the mucosa. The mucosa layer is responsible for producing mucus, which acts as a lubricant to facilitate the movement of food through the digestive system. The mucus also protects the digestive organs from the effects of digestive enzymes and stomach acid.