Fact 1: Bivalves feed on plankton and nonliving organic matter.

Fact 2: Mussels are bivalve mollusks.

Given the two facts above, answer the question "What feeds on plankton and nonliving organic matter?" with the following options: 
- barnacles
 - mollusks
 - animals
 - the Sun
 - sharks
 - graptolites
 - bacteria
 - dogs


 

  mollusks       