You are presented with the question "What is a major food source for other organisms, including humans?" and the following answer choices: 
- gastropod shells
 - orchids
 - invertebrates
 - swamp vegetation
 - Most plants
 - insects
 - barnacles
 - animals

Now knowing that mollusks are a major food source for other organisms, including humans and mollusks are invertebrates and are no exception, choose the best answer.


 

   invertebrates      