Level: M DRA: 28 Science Strategy: Monitor/Clarify Word Count: 581 3.5.21 Build Vocabulary HOUGHTON MIFFLIN Online Leveled Books ISBN-13: 978-0-547-02174-4 ISBN-10: 0-547-02174-7 1032073 H O UG H T O N M IF F L IN by Chana Stiefel PHOTOGRAPHY CREDITS: Cover © age fotostock/SuperStock. 1 ImageState/Alamy. 2 ImageState/Alamy. 3 Ted Clutter/ Photo Researchers, Inc. 8 © age fotostock/SuperStock. 9 © Tom Brakefield/CORBIS. 10 Roger Eritja/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: 978-0-547-02174-4 ISBN-10: 0-547-02174-7 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. Introduction Have you ever seen ants at a picnic? They crawl all over. They scout out food. Then they carry it back to their nest. Ants are tiny but amazing insects. In fact, they are a lot like us. They live and work in groups. They gather and store food. Ants also take care of each other. To find out more about these busy bugs, dig in! Ants work together to collect food.  Ants All Around Ants have lived on Earth for more than 100 million y

阅读全文