It is only one...................
It can attacks a cell because germs spread fast throught the body and that is why you need medication to help you when you are sick so it does not get worse so if you have a virus you need medication so it does not harm you even more.
You can mix them by the same thing of generic
Because the interior of the lipid bilayer contains the nonpolar _____molecules__________, only small nonpolar substances are able to diffuse directly across the cell membrane