Level: I DRA: 16 Science Strategy: Monitor/Clarify Word Count: 266 2.2.10 Build Vocabulary by Erika Sparks HOUGHTON MIFFLIN Online Leveled Books 1033019 H O UG H T O N M IF F L IN by Erika Sparks PHOTOGRAPHY CREDITS: Cover Frederic Pacorel/Stock Image/Jupiter Images. 1 ImageState/Alamy. 2-3 (border) © 2007 Jupiter Images. 2 Liquid-Light Underwater Photography/Alamy. 3 James Watt/Index Stock Imagery/Jupiter Images. 4 Frederic Pacorel/Stock Image/Jupiter Images. 5 Pure Stock/Jupiter Images. 6-7 Jeff Hunter/Getty Images. 8 David Burdick/NOAA. 9 AP Photo/National Marine Fisheries Service via Honolulu Star Bulletin. 10 ImageState/Alamy. Copyright © by Houghton Mifflin Harcourt Publishing Company All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying or recording, or by any information storage and retrieval system, without the prior written permission of the copyright owner unless such copying is expressly permitted by federal copyright law. Requests for permission to make copies of any part of the work should be addressed to Houghton Mifflin Harcourt School Publishers, Attn: Permissions, 6277 Sea Harbor Drive, Orlando, Florida 32887-6777. Printed in China ISBN-13: 978-0-547-02891-0 ISBN-10: 0-547-02891-1 1 2 3 4 5 6 7 8 0940 18 17 16 15 14 13 12 11 If you have received these materials as examination copies free of charge, Houghton Mifflin Harcourt School Publishers retains title to the materials and they may not be resold. Resale of examination copies is strictly prohibited. Possession of this publication in print format does not entitle users to convert this publication, or any portion of it, into electronic format. Coral reefs are home to many plants and animals. Coral reefs are hard and feel like stone. But they are made by living animals. 2 2_000000_VR2_5BL_CoralReefs.indd2 2 1/17/08 12:34:40 PM Coral is an animal that is wrapped inside a shell. When this ani