You are presented with the question "What feeds on nonliving organic matter?" and the following answer choices: 
- rabbit
 - crocodiles
 - mussels
 - oxygen
 - skateboard
 - barnacles
 - trucks
 - fungi

Now knowing that bivalves feed on plankton and nonliving organic matter and mussels are bivalve mollusks, choose the best answer.


 

   mussels      