Challenge : figure out this i have two legs, but they only touch the ground while i'm at rest. what am i?

What impact does the use of dashes have on the rhythmic structure of this poem? the dashes create imperfect rhyme that confuses the reader. the dashes create a slow rhythm that is pleasant for the reader. the dashes create a quick rhythm that confuses the reader. the dashes create a heightened rhythm that excites the reader.