Select all the features of mollusks.

Mollusks, also known as Mollusca, are a group of invertebrate animals that include a wide variety of species, from squids to snails. Here are some common features of mollusks:

1. Soft-bodied: Mollusks are known for their soft bodies, which are often protected by a hard shell.

2. Bilateral symmetry: Mollusks have bilateral symmetry, which means their left and right sides are mirror images.

3. Mantle: This is a significant part of a mollusk's anatomy. It's a skin-like organ that often secretes a shell.

4. Radula: Most mollusks have a radula, a unique feeding organ used to scrape or cut food.

5. Muscular foot: Many mollusks have a muscular foot used for movement.

6. Shell: Many, but not all, mollusks have a shell. The shell is typically made of calcium carbonate and is secreted by the mantle.

7. Visceral mass: This is the part of the mollusk that contains its organs.

8. Complete digestive tract: Mollusks have a complete digestive tract, which means they have a separate mouth and anus.

9. Respiration: Most mollusks breathe using gills, though some land species have lungs.

10. Circulatory system: Mollusks have an open circulatory system, meaning their blood isn't always enclosed within vessels.

These are some of the general features of mollusks, but it's important to note that there is a lot of diversity within this group, and not all species will have all these features.