Which part of a textbook lists alphabetically all topics covered in the book along with their page numbers?

because i have already answered your question several times, answering it again would be superfluous.

by elena

i think the answer is d.

the strategies is fictional storied

  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.