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It describes how DDT enters streams, soil, and living organisms, then moves through the food chain. The narrative follows peregrine falcons as they begin to die, showing scientists’ investigations into egg shell thinness caused by DDT, resulting in cracked eggs and chicks dying.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/the-return-of-the/570278/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/the-return-of-the/570278.png","ImageObject",300,407,{"name":92,"@type":93},"Muffet","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-20","2026-10-13",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is DDT, and why was it used?","Question",{"text":112,"@type":113},"DDT was a poison made to get rid of pests. It was used in the United States years ago to kill insects that can make people sick when they sting.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does DDT spread through the environment and living things?",{"text":117,"@type":113},"DDT gets into streams and soil, and it stays in the bodies of living things that eat, drink, and live in those environments.",{"name":119,"@type":110,"acceptedAnswer":120},"How did DDT harm peregrine falcons?",{"text":121,"@type":113},"After peregrine falcons began to die, scientists found that DDT caused egg shells to dry out and become very thin, so eggs cracked and chicks were not fully formed, leading to death.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},570278,1792299611,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":46,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":31},962090768927,"https://ap-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","THE RETURNOF打HEPEREGRINEFALCONBY SUSAN BLACKABYCHarcourt  \nCover,CJohn Shaw/Bruce Coleman,Inc.;p.2,OWilliam H.Mullens/Photo Researchers,Inc.;p.3,CAdam Jones/Photo researchers,Inc.;p.4 CJohn Mitchell/Photo researchers,Inc.;p.5,CJohn Shaw/Bruce Coleman,Inc.;p.6,ODr.Fred J./Photo Researchers,Inc.;p.7,ORobertPelham/Bruce Coleman,Inc.;p.8-9,CFrans Lanting/Minden Pictures;p.10-11,CWilliam H.Mullens/Photo Researchers,Inc.;p.11,12,CFrans Lanting/Minden Pictures;p.13,OStephen  \nJ.Krasemann/Photo researchers,Inc.;p.14,CR.J.Erwin/Photo Researchers,Inc.;p.15,CFred Alsop Ⅲ/Bruce Coleman,Inc.;p.16,CAlan &Sandy/Photo Researchers,Inc.  \nCopyright o by Harcourt,Inc.  \nAll rights reserved.No part of this publication may be reproduced or transmitted in any formor by any means,electronic or mechanical,including photocopy,recording,or any informationstorage and retrieval system,without permission in writing from the publisher.  \nRequests for permission to make copes of any part of the work should be addressed toSchool Permissions and Copyrights,Harcourt,Inc.,6277 Sea Harbor Drive,Orlando,Florida32887-6777.Fax:407-345-2418.  \nHARCOURT and the Harcourt Logo are trademarks of Harcourt,Inc.,registered in the UnitedStates of America and/or other jurisdictions.  \nPrinted in China  \nISBN 0-15-323121-1  \n# Ordering Options\n\nISBN 0-15-325523-4(Grade 2 Advanced-Level Collection)ISBN 0-15-326971-5(package of 5)  \n# THE RETURN OF THE\n\nSHarcourt  \nOrlando Boston Dallas Chicago San Diego  \nVisit The Learning Site!  \nwww.harcourtschool.com  \n# 夏二\n\nDDT is a poison that was made to get ridof pests.It was used in the United States yearsago.It killed insects that can make you sickwhen they sting you.DDT seemed like a goodthing,but it caused bad things to happen.  \nDDT got into the streams and the soil aswell as on the insects.Living things that ateand drank food and water had DDT inthem.The DDT stayed in their bodies.  \nIt is typical for small birds to eat bugs.Itis typical for some large birds to eat smallbirds.When small birds ate insects sprayedwith DDT,the DDT got into the birds'  \nbodies.When large birds ate the small birds,the DDT got into their bodies,too.  \nAt first,scientists did not know that DDTcould harm birds.Then peregrine falconsbegan to die.Scientists wondered if all theperegrine falcons would die.Something hadto be done to save them.  \nFor those falcons that lived,the DDT intheir bodies caused other problems.Whenthe females laid eggs,the shells were verythin.The eggs cracked when the motherbirds sat on them.The chicks were not fullyformed,and they died.  \nPeople were confused about what couldhave caused this problem.As the years wentby,it looked as if the falcons were going todie out.  \nScientists studied the falcons'eggshells tosee what was going on.They discoveredthat the thin shells had a lot of DDT in  \nthem.The DDT caused the shells to dry outand crack.The DDT was the problem.","cbCaiqduFwGk3ssn","https://ap.wps.com/l/cbCaiqduFwGk3ssn","pdf",3762435,"English","# Ordering Options\n# DDT and ecosystem impact\n## Food chain transfer\n## Peregrine falcon decline\n## Eggshell thinning and chick deaths","[{\"question\":\"What is DDT, and why was it used?\",\"answer\":\"DDT was a poison made to get rid of pests. It was used in the United States years ago to kill insects that can make people sick when they sting.\"},{\"question\":\"How does DDT spread through the environment and living things?\",\"answer\":\"DDT gets into streams and soil, and it stays in the bodies of living things that eat, drink, and live in those environments.\"},{\"question\":\"How did DDT harm peregrine falcons?\",\"answer\":\"After peregrine falcons began to die, scientists found that DDT caused egg shells to dry out and become very thin, so eggs cracked and chicks were not fully formed, leading to death.\"}]","THE RETURN OF THE | PDF",1791880223]