The word "no"

Our languages
Started out with
One word: No.
To decline is so
Human; what other species
Is convinced that a simple
Utterance can achieve a goal?
We say "no" when we mean
"Yes", too. Of all the
Organisms, I like trees
Most. They do not need
Sound or excuses to
Prove their might.
And if they must be
Cut down, so be it.
They always die
With dignity.
You or me?
Well, wouldn't our
Last word be "no" ?