An educated guess that is aslo posed as a tentative explanation is called a hypothesis.
<span>There are a small number of boys who, after possibly contracting mumps, could experienced decreased fertility in the future. Giving a mumps vaccine, since it's a weaker version of the virus, will allow the body to fight it off without the negative effects that could come with a full version of the illness.</span>
Viruses aren't made out of cells.
Are you talking about the esophagus?
Diffusion is is like (spreading around), so it wouldn't smell that strong the further away you got... but you would still smell it