Suppose that you have discovered that some people have very high saliva buffer concentrations, while others have very low buffer concentrations. Explain your answer. Buffers resist pH changes. The pH in HB people should fall less than the pH in LB people. Because of this, HB people should have fewer cavities.
Bacteria lower the pH by metabolizing the sugar to acids.
You have a child with a high fever and must cool him quickly. You can put him in either cold air or cold water. Put the child in water. Water has much higher heat capacity and heat conductance than air and the child will cool much faster. Because they are charged they conduct electricity in nerves and other excitable tissues.