I don't fully understand your question but what i assume you are trying to ask is WHY her mucus is part of the chain of transmission.
JoAnn's mucus still contains active cultures of the cold virus that is affecting JoAnn. thus her mucus would be able to transmit the virus to others.
Ergonomic .........................
Given that,
An expression : -16z +20z³
To find,
Simplify the above expression.
Solution,
We have, - 16z +20z³
Taking common part.
= 4z(-4+5z²)
So, the simplified form of the given expression is 4z(-4+5z²).
I believe the heart should beat about 20-40 times
