Fact 1: Minerals are chemical elements that are essential for body processes.

Fact 2: Potassium is a mineral, like calcium .

Given the two facts above, answer the question "What is essential for body processes?" with the following options: 
- grass
 - wine
 - Energy
 - wicker
 - oxygen
 - sleep
 - potassium
 - Energy.


 

       potassium  