Let's think step by step! What are a major food source to organisms including humans?
Options:
- (A) leeches
- (B) earthworms
- (C) snails
- (D) plants
- (E) tapeworms
- (F) trees
- (G) potatoes
- (H) bushes
The thinking starts now:
Mollusks are a major food source for other organisms, including humans. Mollusks in the diorama include snails and clams. Snails are a major food source for other organisms, including humans. The final answer: (C).