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

Fact 2: For instance, glucose is a sugar.

Given the two facts above, answer the question "what is used for energy by the cells of most organisms?" with the following options: 
- sugar
 - cell walls
 - Sun
 - Light
 - food
 - maples
 - nucleus
 - electrons


 

 sugar        