Evolution is an essential part of
biochemistry
Evolution is at the heart of modern biological thought.  One tenant of
evolution is that all species evolved from some other species and all
life evolved from some common ancestors.  This means that all
organisms are related and therefore similar.  In general our goal as
scientists is to understand better the human condition.  However, for
the most part our study of humans is rather limited.  The study of other
organisms is generally carried out and our findings extrapolated to
humans.  Almost everything that we know about biochemistry was
first discovered in bacteria and yeast.  At the same time we can’t know
everything from these simple organisms.  It is important to pick the
right model system; the choice being dependent on the question asked.