Mollusks are a major food source for other organisms, including humans.
Many organisms are omnivores with variable diets.
Humans have variable diets and some consume mollusks as a major food source.
What are mollusks used for?

1. a herbivore diet
2. survival
3. a vegetarian diet
4. Converting waste.
5. Catch prey
6. an omnivore diet
7. an egg diet
8. animal transport