Extended ebook content for Cracking The AP Biology Exam

Excerpted from Cracking The AP Biology Exam by the Staff of The Princeton Review. Copyright © 2014 by TPR Education IP Holdings, LLC. Excerpted by permission of The Princeton Review imprint of the Random House Children's Group, a division of Random House LLC. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.