The car has undergone major redesigns and upgrades in the past few decades. For instance, car windows used to have to be rolled down manually. Now drivers can push a button to roll their windows up and down. The body of the car has been changed as well. In particular, the front of the car has been changed so that in case of a crash, the very front of the car will absorb more of the impact. The intent is to leave the cabin area intact so that the driver and passengers will not be harmed. The first example is a(n) modification, while the second change is an example of a(n) modification.