Why do frogs need salivary glands and why do fish do without them?

To make it easier for the frog to turn over its dry prey, which it has caught, this prey must be moistened with saliva, and then allowed to split.
And fish do not have salivary glands, since the glandular cells of the pharynx and oral cavity secrete mucus, which has no digestive fragments and is only needed to swallow food.



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