In the human body, the enzyme carbonic anahydrase catalyzes the interconversion of CO₂ and HCO₃^- by either adding or removing the hydroxide anion. The overall reaction is endothermic. Explain how the following affect the amount of carbon dioxide:

(a) Increasing the amount of bicarbonate anion;

(b) Increasing the pressure of carbon dioxide;

(c) Increasing the amount of carbonic anhydrase;

(d) Decreasing the temperature.