Please help
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She will give you a call if she has the time.

The world would be a better place if everyone made a change. If we go to Paris, we will visit the Eiffel Tower.

Explanation:

the noun in this is person

  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.