و آر ایل:https://d20ohkaloyme4g.cloudfront.net/img/document_thumbnails/a6cb298d154f798960b4f13497c648e9/thumb_1200_1553.png
و آر ایل:https://www.studocu.com/en-us/document/university-of-washington/introductory-biology/ddt-infographic-ddt-info/78630959
