You are presented with the question "Fatty acids that circulate in the blood may contain other what?" and the following answer choices: 
- organs
 - Acids
 - Energy
 - Energy.
 - molecules
 - hydrocarbons
 - cell walls
 - waters

Now knowing that lipids may consist of fatty acids alone, or they may contain other molecules as well and lipids are the fats that circulate in blood, choose the best answer.


 

     molecules    