Producers make food from inorganic molecules, and primary producers make up the lowest trophic level. Given these facts, what do organisms in the lowest trophic level use as food among the following options:
- Organic compounds
 - food and shelter
 - heat energy
 - Chemical energy
 - Chlorophyll
 - members of their own species
 - scarce resources
 - inorganic molecules


 

        inorganic molecules 