Having good work ethic
Gets along with other employees
Not having to be told more than once to do a certain task
The answer is A, the immune system
A. a disease that affects a person for a long time
If the disease is communicable, it is contagious. If it is airborne, it is transferred through the air, as opposed to physical touch or blood-borne. Being in a confined space, such as an ambulance, with an airborne communicable disease means you have most definitely been exposed to it.