Fact 1: Some viruses have an envelope of phospholipids and proteins.

Fact 2: Phospholipids are body fats, too.

Given the two facts above, answer the question "besides proteins, what do some viruses have an envelope of?" with the following options: 
- bioaerosols
 - parasites
 - more abundant
 - gravity
 - heat energy
 - Energy
 - red blood cells
 - body fats


 

        body fats 