Which contrast beat helps develop the theme of friendship in this chapter of roll of thunder hear my cry

the answer is the last one

what is the context here? we need to know what story you're talking about : )

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.