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

Fact 2: Most animals that live on rocky shores eat plankton.

Given the two facts above, answer the question "Most animals that live on rocky shores eat what?" with the following options: 
- after too much water received
 - scarce resources
 - nonliving organic matter
 - mammals
 - Something made from fermented ricce
 - large animals
 - birds
 - harmful substances


 

   nonliving organic matter      