You are presented with the question "What is a major food source for humans?" and the following answer choices: 
- poison dart frogs
 - honeybees
 - barnacles
 - intervertebrates
 - other humans
 - photosynthesis
 - the body's largest organ
 - Most plants

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.


 

    intervertebrates     