Fact 1: Lipids may consist of fatty acids alone, or they may contain other molecules as well.

Fact 2: Lipids Lipids are also composed of carbon, oxygen and hydrogen.

Given the two facts above, answer the question "What can fatty acids be combined with, in addition to carbon and oxygen?" with the following options: 
- Sodium
 - Energy.
 - glucose
 - Carbon Dioxide
 - Fuel cells
 - Uranium
 - Hydrogen
 - Energy


 

       Hydrogen  