If mussels eat plankton and nonliving organic matter, then what do mussels eat?

Answer choices:
- bivalves
 - sub-units of species
 - Something coming from a gland
 - mussels
 - plankton and nonliving organic
 - Something made from fermented ricce
 - mollusks
 - Microscopic organisms

 

     plankton and nonliving organic     