Hello! I'll be happy to help you with this question.
The correct answer is: sleeve
Explanation:
1. Radula: This is a characteristic feature of mollusks used for feeding. It is a tongue-like organ with small, chitinous teeth that helps in scraping or cutting food.
2. Foot: The foot is a common body part in mollusks that is used for movement, attachment, and sometimes for digging.
3. Mantle: The mantle is a soft tissue that covers the mollusk's body and secretes the shell in shelled mollusks like clams, snails, and octopuses.
4. Sleeve: Unlike radula, foot, and mantle, sleeve is not a recognized body part of mollusks. It does not have a specific anatomical association with mollusks.
Therefore, out of the options provided, "sleeve" is NOT a body part of a mollusk.
