This biology textbook went from having torn pages, 100+ creased pages and many sticky notes on top, to only minor creases in the paperback cover, no creases or writings inside its pages, repaired tears, and a protective film preventing future wear and tear, thanks to the wonderful efforts of the Readnewable staff! Enjoy this brilliant free textbook, so that you can not only save money spent on textbooks, but also take part in our mission to make learning sustainable!