High and low concentrations of hydrogen
The best-known component of gastric juice is hydrochloric acid, the secretory product of the parietal, or oxyntic cell. It is known that the capacity of the stomach to secrete HCl is almost linearly related to parietal cell numbers.
It means the material is fragile and can break/collapse easily. For example, some cookies are brittle because they flake off when you touch them.
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Answer:
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Explanation: