You are presented with the question "besides proteins, what do some viruses have an envelope of?" and the following answer choices: 
- bioaerosols
 - parasites
 - more abundant
 - gravity
 - heat energy
 - Energy
 - red blood cells
 - body fats

Now knowing that some viruses have an envelope of phospholipids and proteins and phospholipids are body fats, too, choose the best answer.


 

        body fats 