Creatures often suffer changes in conditions of their surroundings from the womb to the tomb through the climate alterations and their own movements, and may have various strategies in place to overcome such environmental changes. Among the conditions they encounter, the pH of environments surrounding creatures varies dramatically during lifespans, especially in microorganisms. In humans, the skin covering the body prevents acidification inside the body, and cells are surrounded by body fluid whose pH is kept at 7.4. Nevertheless, pH surrounding cells is often acidified, especially diseased...