Fact 1: Glucose is used for energy by the cells of most organisms.

Fact 2: After hours of no glucose ingestion, fats and proteins can be used for energy.

Given the two facts above, answer the question "ats and proteins can be used for energy by the cells of what?" with the following options: 
- mammals
 - Plants growth
 - Most plants
 - our planet
 - microorganisms
 - bacteria
 - most organisms
 - animals


 

       most organisms  