How does carbonic anhydrase change the reaction between carbon dioxide and water?

It catalyzes the reaction by making it fast (both forward and reverse reactions).

Naturally, the reaction between CO2 and H2O is very slow in the formation of carbonic acid. However, in the blood, due to the presence of the enzyme, the reaction is much rapid by millions of factors. This is because the enzyme reduces the activation energy of the reactants.  The enzyme is important in respiration of cells and in pH regulation,

there really is life in the deepest part

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.