Why are buffers important to living things ?

Living systems are very sensitive to pH changes.  Your blood, for example, has a pH of about 7.4.  A rise or drop greater than 0.05 would require hospitalization (alkalosis and acidosis respectively).  A rise or drop of 0.2 is fatal.  If it weren't for the blood-buffering system, then swings this high and greater would be easy to accomplish and maintaining a living system would essentially be impossible.

I hope I answer your question.

50.23 i believe is correct but don't quote me on that.