Adaption, as the world changes, you must change with it to survive. In a way, it's like natural selection, if you don't adapt to the surrounding environment and your unique situation, you will fall behind in the fast pace of society.
Culture can be applied to this as well; for all of time, the human race has changed and evolved. If this wasn't true, we would still be living a nomadic life, or even still swinging in trees. Because of the constant adaption, we are able to keep evolving and surviving; it is in human nature to adapt. While those that can't keep up are left behind, never to grow and expand.
