Fact 1: Producers make food from inorganic molecules.

Fact 2: Primary producers make up the lowest trophic level.

Given the two facts above, answer the question "What do organisms in the lowest trophic level use as food?" with the following options: 
- Organic compounds
 - food and shelter
 - heat energy
 - Chemical energy
 - Chlorophyll
 - members of their own species
 - scarce resources
 - inorganic molecules


 

        inorganic molecules 