If clams and oysters feed on plankton and nonliving organic matter, then what do clams feed on?

Answer choices:
- sand particles
 - jellyfish
 - Something made from fermented ricce
 - plankton and nonliving organic
 - minnows and other small fish
 - Something that is secreted in a shallow cup.
 - Something with a head, thorax, and abdomen
 - sub-units of species

 

    plankton and nonliving organic      