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

Fact 2: Fatty acids are the building blocks of lipids.

Given the two facts above, answer the question "What of lipids may contain other molecules as well?" with the following options: 
- empty spaces
 - big spaces
 - building blocks
 - small parts
 - solid, liquid, gas
 - Organic compounds
 - layers of fat
 - bioaerosols


 

   building blocks      