Epistemology

Hi!

I have a question that is related to Epistemology. Our task
at hand is to match a theory of knowledge, a theory of reality,
and a theory of truth. Apply it in essay form and show an
example showing our instructor we have the basic understanding.
All three have to work with each other though. My example
was going to be "everything that lives must experience death".
For this example I have taken A'posteriori Knowledge, Critical
Realism, and Coherence or Objective theory. Narrowing in on
the (knowledge part, where I am having trouble) I was wondering if Plato or Descartes
was better to use for the example. I have a rough draft or skeleton frame of
my essay I was going to use :

Death is an unavoidable end of life. It is an undisputed fact
that everything that lives must die. We are all familiar with
death in some way, be it directly or indirectly. Death is
a critical reality we all must face. There are no facts to
refute it and no facts to deny it. Even someone with a belief
system of an afterlife still has to accept that it requires
the actual event of death. Everyone dies , not exactly in
the same way but still the end result is death.

Any help you could provide will be appreciated.

Thanks,
Susan