So we can easily classify animals and distinguish their relationships
Answer:
Lipids and proteins
Explanation:
It gets lipids from the membrane of the host cell it attaches to.
The proteins on the envelope are from the original virus itself.
Pepsin is produced in the stomach and breaks some of the peptide bonds in polypeptide chains.
Vestigial structures<span> are often homologous to </span>structures<span> that are functioning normally in other species</span>
C. cell wall. This discovery was made by Robert Hooke upon studying the honeycomb like structure of cork and compared it to the dead appearance of the cell wall.
