What is the function of a radula in mollusks?

The radula is a specialized feeding organ found in many mollusks, such as snails and slugs. Its primary function is to scrape or cut food before it enters the mouth, making it essential for their feeding process. The radula consists of a ribbon-like structure covered in tiny, chitinous teeth, which allows mollusks to efficiently collect food particles, especially in herbivorous species where it can scrape algae off surfaces, or in carnivorous species where it might be used to tear flesh.

The other options do not accurately represent the role of the radula. While protecting against predators and aiding in locomotion are important functions in the biology of mollusks, they are not related to the radula's design or purpose. Furthermore, housing organs for digestion pertains to the digestive system but not specifically to the radula itself, which is not involved in the digestive process but rather in the initial act of feeding.