Fact 1: Mollusks are a major food source for other organisms, including humans. Fact 2: Mollusks are invertebrates and are no exception. Given the two facts above, what is a major food source for humans?

Pick your answer from: [I] poison dart frogs [II] honeybees [III] barnacles [IV] intervertebrates [V] other humans [VI] photosynthesis [VII] the body's largest organ [VIII] Most plants
The answer is:
[IV]