Some viruses have an envelope of phospholipids and proteins, and viruses are strange life forms. Given these facts, some strange life forms have an envelope of what among the following options:
- Chemical energy
 - biological diversity
 - Something coming from a gland
 - layers of fat
 - characteristics
 - phospholipids and proteins
 - Positive charges
 - visible energy


 

      phospholipids and proteins   