Poetry and Rhymes

Which of these is a word for the rhythmical element in poetry?

More Questions from Poetry and Rhymes
In "This Old Man", what did the old man play knick-knack on first?
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What chased the "Three Little Pigs"?
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What river did the crocodile from Lewis Carroll's poem live in?
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Whose poem is titled "The Blue Angel"?
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After who's poem is Chinua Achebe's novel "Things Fall Apart" named?
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Groups of lines in poetry are called what?
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What did the old woman in the shoe have too many of?
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Whose poem is titled "Falling Awake"?
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