You are presented with the question "What do clams and oysters eat?" and the following answer choices: 
- Energy.
 - Plankton
 - Energy
 - Oysters
 - glucose
 - Clams
 - Fish
 - barnacles

Now knowing that bivalves feed on plankton and nonliving organic matter and clams and oysters are examples of bivalves, choose the best answer.


 

  Plankton       