You are presented with the quiz "What is seafood used for?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mollusks are a major food source for other organisms, including humans" and "seafood, such as mollusks and crustaceans, can be a source of cadmium, as well". 

So, what's the best answer to the question?


 

       Food    