I’m only half way to the moon

Why does a tree or a plant
Have more DNA than me
Am, I any less evolved?
Then a plant or a tree!

So we're all coded.
By 4 letters A, C, T, and G
But, where am ‘I' on-
The amino acid chain, me!

What part of the codon wheel?
Do I belong, too…?
So proteins are building blocks.
Bricks in the wall, a menu!

So, on their ladder, I've got-
6,000,000,000 'rungs' of DNA
That if stretched like snot
Would, reach halfway to the moon.

But still 'I' isn't as evolved
As a plant or a tree
We humans, all 99% alike
So laugh you're related to me.