You are presented with the question "What can fatty acids be combined with, in addition to carbon and oxygen?" and the following answer choices: 
- Sodium
 - Energy.
 - glucose
 - Carbon Dioxide
 - Fuel cells
 - Uranium
 - Hydrogen
 - Energy

Now knowing that lipids may consist of fatty acids alone, or they may contain other molecules as well and lipids Lipids are also composed of carbon, oxygen and hydrogen, choose the best answer.


 

       Hydrogen  