The single part

I’m one human being in the world,
Just like a small sand grain in a huge desert.
Feeling as a drop of water in the whole ocean,
I’m a single leaf in the big tree.
I’m just one of the billions cells that form a body.
But I’m there. Without me it would be the same
But we’re there. Without all us, it won’t be the same.

(Pic taken by me, click on it or here to enlarge)