saltiness of the water changes all the time.
saltiness of some foods.
They have to cope with a changeable environment, because the saltiness of the water changes all the time.
Also, our taste buds get used to high levels of salt, so you might not notice the saltiness of some foods.
People with CF have sweat that is much saltier than normal, and measuring the saltiness of a person's sweat is the most important diagnostic test for CF.
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