tailieunhanh - Darrell Gulin/Getty Images.EcologyThree generations of reticulated giraffes are interacting on an African savanna. Females start breeding at around five years old, and gestation is about 15 months. Calves are born from a standing female, dropping six f

Science is occurring all around you, and the opening photo of each chapter will preview the science you will be learning about. The Chapter Preview will give you an idea of what you will be learning about, and you can try the Launch Lab to help get your brain headed in the right direction. The Foldables exercise is a fun way to keep you organized. | - memos science ỷ NATIONAL GEOGRAPHIC Grew liniM Glencoe New York New York Columbus Ohio Chicago Illinois Peoria Illinois Woodland Hills California Darrell Gulin Getty Images Ecology Three generations of reticulated giraffes are interacting on an African savanna. Females start breeding at around five years old and gestation is about 15 months. Calves are born from a standing female dropping six feet to the ground They weigh 100 to 150 pounds and are six feet tall at birth. Me Gnaw IỈH1H Glencoe The McGraw-Hill Companies Copyright 2005 by The McGraw-Hill Companies rights reserved. Except as permitted under the United States Copyright Act no part of this publication may be reproduced or distributed in any form or by any means or stored in a database or retrieval system without prior written permission of the publisher. The National Geographic features were designed and developed by the National Geographic Society s Education National Geographic name National Geographic Society and the Yellow Border Rectangle are trademarks of the Society and their use without prior written permission is strictly prohibited. The Science and Society and the Science and History features that appear in this book were designed and developed by TIME School Publishing a division of TIME and the red border are trademarks of Time Inc. All rights reserved. Send all inquiries to Glencoe McGraw-Hill 8787 Orion Place Columbus OH 43240-4027 ISBN 0-07-861746-4 Printed in the United States of America. 2 3 4 5 6 7 8 9 10 027 055 09 08 07 06 05 04 Darrell Gulin Getty Images Authors NATIONAL GEOGRAPHIC Education Division Washington . Peter Rillero PhD Associate Professor of Science Education Arizona State University West Phoenix AZ Dinah Zike Educational Consultant Dinah-Might Activities Inc. San Antonio TX Series Consultants CONTENT SAFETY Michael A. Hoggarth PhD Department of Life and Earth Sciences Otterbein College Westerville OH Sandra West .