You are presented with the question "What is the major thing that biological membranes consist of?" and the following answer choices: 
- chemicals
 - glucose
 - lipids
 - Energy
 - complex
 - oxygen
 - matter
 - an ion

Now knowing that lipids may consist of fatty acids alone, or they may contain other molecules as well and all biological membranes contain lipids as the major constituent, choose the best answer.


 

   lipids      