X is for Xylem it's the part of the tree and all other plants you see. Like all God's handiwork, it does more than one or two things. Most importantly,to the leaves, the root's water it brings. But it also brings nutrients so the plant can grow like it should, and gives trees rigidity when it turns into wood. It's an unknown hero that goes on without praise, but without it there'd be no food you could raise. All plants would die the air would die too, and there'd be no world left for me or for you.