What are unique features of molluscs?

1. Soft body: All mollusks have soft bodies, which makes them vulnerable to predators and the environment. However, their soft bodies have also allowed them to adapt to a wide range of habitats.

2. Hard shell: Most mollusks have a hard shell, which they use for protection. The shell is made of calcium carbonate, and it can be very hard and strong.

3. Mantle: The mantle is a flap of tissue that covers the body of the mollusk. The mantle produces the shell, and it also contains the gills and other organs.

4. Foot: The foot is a muscular structure that the mollusk uses for locomotion. The foot can be used to crawl, swim, or burrow.

5. Radula: The radula is a rasping tongue that is used to scrape food. The radula is covered in tiny teeth, and it can be very effective at scraping food from surfaces.