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.
I think its A because cannibis salvita is also used in marijuana
The correct answer is B.
Air pollution can cause cardiovascular diseases as the pollutants in the air can damage your heart and lungs. This isn't always the case but if you live in a highly polluted area you are running the risk of developing a cardiovascular disease as well as other diseases related to the inhalation and exposure of toxins and chemicals in the air.
