You are presented with the question "What do organisms in the lowest trophic level use as food?" and the following answer choices: 
- Organic compounds
 - food and shelter
 - heat energy
 - Chemical energy
 - Chlorophyll
 - members of their own species
 - scarce resources
 - inorganic molecules

Now knowing that producers make food from inorganic molecules and primary producers make up the lowest trophic level, choose the best answer.


 

        inorganic molecules 