Answer:
I sometimes use a tissue when blowing my nose, I mean, my organs are made up of cells and tissue. I am also a multicellular organism, as I am made up of multiple cells; however, I am not a unicellular being, as, again, I am made up of multiple cells. I don't think I possess a xylem because I am not a plant, but plants do! They use them to transfer water around and stuff. Me being a human and all, I am a large system of different organs, tissue, and such.
Explanation: i used the words provided