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Mucus
the main reason is thought to be that it acts as a protective mucus layer to help prevent parasites from attaching. different species use the mucus for different purposes
The outermost layer of most fish is scales.
The stomach has a lining of protective mucus.
the answer is mucus
The inner lining of the stomach is coated in a thick layer of protective mucus that prevents powerful digestive acids and enzymes from damaging the organ. The stomach walls themselves are thick membranes that are similarly protective against corrosion.
Mucus,spikes,scales.
Mucus produced by goblet cells in the lining the stomach forms a protective layer preventing the stomach from digesting itself.
Since they are guard dogs, and very protective.
it is the mucus secretion
Gyslo protein mixed in with water.
a mucus membrane