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

Fact 2: Some viruses are also enclosed by an envelope of fat and protein molecules.

Given the two facts above, answer the question "What are some viruses enclosed by? " with the following options: 
- sub-units of species
 - phospholipids, fat, molecule
 - Germy surfaces
 - it keeps an organism warm
 - Something that comes in a bundle of fibers
 - Something made from fermented ricce
 - microorganisms
 - A compound that donates proton


 

  phospholipids, fat, molecule       