1、Andrew Syred/Science Photo Library/Photo Researchers i-01-LBA-861734 08/19/2004 10:58 AM Page iLifes Structureand FunctionThese human red blood cellsare part of a liquid tissueblood.They deliver oxygenand remove wastes.The protein hemoglobin givesthem their red color,and contains iron to transport o
2、xygen and carbon dioxide.Send all inquiries to:Glencoe/McGraw-Hill8787 Orion PlaceColumbus,OH 43240-4027ISBN:0-07-861734-0 Printed in the United States of America.2 3 4 5 6 7 8 9 10 027/055 09 08 07 06 05 04Copyright 2005 by The McGraw-Hill Companies,Inc.All rights reserved.Except as permitted under
3、the United States Copyright Act,no part of this publication may be reproduced or distributed in anyform 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 Geographi
4、c SocietysEducation Division.Copyright National Geographic Society.The name“National Geographic Society”and the Yellow Border Rectangle are trademarks of the Society,and their use,without prior writtenpermission,is strictly prohibited.The“Science and Society”and the“Science and History”features that
5、 appear in this book weredesigned and developed by TIME School Publishing,a division of TIME Magazine.TIME and the redborder are trademarks of Time Inc.All rights reserved.Andrew Syred/Science Photo Library/Photo Researchers i-01-LBA-861734 08/19/2004 10:59 AM Page iiCONTENTConnie Rizzo,MD,PhDDepart
6、ment of Science/MathMarymount Manhattan CollegeNew York,NYDominic Salinas,PhDMiddle School Science SupervisorCaddo Parish SchoolsShreveport,LAMATHTeri Willard,EdDMathematics Curriculum WriterBelgrade,MTREADINGElizabeth BabichSpecial Education TeacherMashpee Public SchoolsMashpee,MACarol A.Senf,PhDSc
7、hool of Literature,Communication,and CultureGeorgia Institute of TechnologyAtlanta,GASAFETYSandra West,PhDDepartment of BiologyTexas State University-San MarcosSan Marcos,TXACTIVITY TESTERS Nerma Coats HendersonPickerington Lakeview Jr.HighSchoolPickerington,OHMary Helen Mariscal-CholkaWilliam D.Sli
8、der Middle SchoolEl Paso,TXScience Kit and BorealLaboratoriesTonawanda,NYAiiiAuthorsSeries ConsultantsMaureen BarrettThomas E.Harrington MiddleSchoolMt.Laurel,NJRobin DillonHanover Central High SchoolCedar Lake,IN Carolyn ElliottSouth Iredell High SchoolStatesville,NC Sueanne EspositoTipton High Sch
9、oolTipton,IN Cory FishBurkholder Middle SchoolHenderson,NVLinda V.ForsythRetired TeacherMerrill Middle SchoolDenver,COMichelle MazeikaWhiting Middle SchoolWhiting,IN Joe McConnellSpeedway Jr.High SchoolIndianapolis,IN Amy MorganBerry Middle School Hoover,ALMark SailerPioneer Jr.-Sr.High SchoolRoyal
10、Center,IN Dee StoutPenn State UniversityUniversity Park,PASeries ReviewersEducation DivisionWashington,D.C.Alton BiggsBiology TeacherAllen High SchoolAllen,TXLucy Daniel,PhDTeacher/ConsultantRutherford County SchoolsRutherfordton,NCDinah ZikeEducational ConsultantDinah-Might Activities,Inc.San Anton
11、io,TX i-01-LBA-861734 08/19/2004 10:59 AM Page iiiWhy do I need my science book?Have you ever been in class andnot understood all of what waspresented?Or,you understoodeverything in class,but at home,got stuck on how to answer aquestion?Maybe you just wondered when you were evergoing to use this stu
12、ff?These next few pages are designed to help you understand everything your science book can be used for.besides a paperweight!Before You ReadChapter OpenerScience is occurring all around you,and the opening photo of each chapter will preview thescience you will be learning about.The ChapterPreview
13、will give you an idea of what you will belearning about,and you can try the Launch Lab tohelp get your brain headed in the right direction.TheFoldables exercise is a fun way to keep you organized.Section OpenerChapters are divided into two to foursections.The As You Read in the margin of the firstpa
14、ge of each section will let you know what is mostimportant in the section.It is divided into four parts.What Youll Learn will tell you the major topics youwill be covering.Why Its Important will remind youwhy you are studying this in the first place!TheReview Vocabulary word is a word you already kn
15、ow,either from your science studies or your prior knowl-edge.The New Vocabulary words are words that youneed to learn to understand this section.These wordswill be in boldfaced print and highlighted in thesection.Make a note to yourself to recognize thesewords as you are reading the section.(bkgd)Jo
16、hn Evans,(inset)Andrew Syred/Science Photo Library/Photo Researchers i-01-LBA-861734 08/19/2004 10:59 AM Page ivAs You ReadHeadingsEach section has a titlein large red letters,and is furtherdivided into blue titles andsmall red titles at the begin-nings of some paragraphs.To help you study,make anoutline of the headings andsubheadings.MarginsIn the margins ofyour text,you will find many helpfulresources.The Science Online exercises andIntegrate activities help you explore the topicsyou are study