You are presented with the question "What do clams feed on?" and the following answer choices: 
- Plankton
 - food
 - glucose
 - Fish
 - Flowers
 - Energy.
 - Energy
 - Other clams

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


 

 Plankton        