You are presented with the question "What feeds on plankton and nonliving organic matter?" and the following answer choices: 
- bacteria
 - barnacles
 - animals
 - sharks
 - pythons
 - graptolites
 - molluscs
 - bears

Now knowing that bivalves feed on plankton and nonliving organic matter and bivalve molluscs are very common, choose the best answer.


 

       molluscs  