Answer:
Advantages :
It helps the person in Landing through parachute. It helps birds diving in the air. In paragliding it gives necessary up thrust so that person remain in air.
Disadvantages:
Air resistance makes airplanes and other air transportation vehicles difficult at more high speeds. When one wants to throw a thing downwards or in some other direction , the actual travelling time will be more than the expected because of air resistance (as it opposes the motion of the body)