Bivalves feed on plankton and nonliving organic matter.
Mussels are bivalve mollusks.
Mussels eat plankton and nonliving organic matter.
What do mussels eat?
  * bivalves
  * sub-units of species
  * Something coming from a gland
  * mussels
  * plankton and nonliving organic
  * Something made from fermented ricce
  * mollusks
  * Microscopic organisms