B Kinds of Change: Magnitude, Rate, Levels, and Significance
Nothing lasts forever. Even granite is ground to sand after a few million years. Permanence is not only impossible, but in the case of humans, it is hardly adaptive. According to what we know about evolution, natural selection favors those who are most flexible and amenable to change. Although constant adaptation might be advantageous to a species over the course of its evolution, relative stability is often useful for individuals within a single lifetime.