This means that cleared forests, which once had moist, fertile soil and plenty of rain become barren and dry.
The liver makes sure that blood glucose levels remain steady. But when blood glucose levels fall, the pancreas secretes glucagon. Therefore the answer to your question in the pancreas.
The one that could be contracted from airborne germs is : Chicken pox
Which why it spread easily. By being in the same room with an infected, you're very likely to be exposed with the viruses even though you never made a contact with the infected
hope this helps