Answer:
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
Three little letters, a paradox to some. The worse that it is, the better it becomes.
What is neither inside the house nor outside the house but a necessity for any home?
Round like a dishpan and smaller than a bathtub. But the ocean can't fill it. What is it?
You throw me out when you want to use me and you take me in when you don't want to use me. Who am I?
Special abilities and brightly colored underwear are all you need to be one of these.