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The A6m erican BIOLOGYTEACHERv SEPTEMBER 1980 * VOLUME 42, NUMBER 6 _~~~~~~~~~n ; Downloaded from http://online.ucpress.edu/abt/article-pdf/42/6/44/38057/4446980.pdf by guest on 23 September 2021 N A B T/ Complete Convention Program includedin thisissue. F 0 S 0 ES _,S _OE Downloaded from http://online.ucpress.edu/abt/article-pdf/42/6/44/38057/4446980.pdf by guest on 23 September 2021 Carolina's New * Carolina Biological Supply Co. I 2700 York Rd. 1980-81 Catalog Burlington, North Carolina 27215 * Please send me a free 1980-81 gives you easy access to thousands of | Carolina Catalog 51. interesting and innovative top-quality Name teaching materials. * Institution * Address Request your free copy today! City State Zip __ _ _ __ _ _ __ _ _ __ _ _ _ Carolina BiologicalSuPolu ComPanu 2700 York Road Box 7 Burlington, North Carolina 27215 Gladstone, Oregon 97027 IFB Researchers & Scientists in 63 films from countries specify CONVIRONplant growth chambers. 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OUR MAJOR PRODUCT LINE IS 800*323*0639 OUR ONLYPRODUCT LINE (In III.312-569-3375) for informationon ourSi 0 or a complete catalogue of ourStratford,n variousLoendbeone chambers tei 5write: 2JUodrn lcmn limited discounted seats available ControlledEnglandemayyar Environments h eupen il ei oea avoid fare increases call for details in Canada-i146i St. James Street, Winnipeg, Canada Arrangements have been made with United R3H 0W9 in U.S.-P.O. Box 347, Pembina, nawarranO Airlines for a United Specialist to assist you ro North Dakota 5827i U.S.A. with your flight reservations when you CONinEroe%i-4 N artoernRoad, phone the above number. Call Monday through Friday, 8:30 a.m. to 5:30 p.m. for this special convention service. SUSTAINING MEMBERS THE NATIONAL ASSOCIATION The AmericanBiology Teacher OF BIOLOGY TEACHERS Journalof the NationalAssociation of BiologyTeachers 1 1250 RogerBacon Drive Reston,Virginia 22090 *ABBOTT LABORATORIES North Chicago, Illinois60064 Joan G. Creager PatriciaA. Masters DeboraM. Bukovskey Editor Assistant Editor AdministrativeAssistant WayneA. Moyer SusanVarney.Nolan *AMERICAN OPTICAL CORPORATION ManagingEditor AdvertisingManager Buffalo, New York 14215 ANN ARBOR BIOLOGICAL CENTER, INC. AnnArbor, Michigan 48103 REVIEW PANEL CharlesBarman Paul Jantzen HowardS. Pitkow CharlesH. Butterfield Garland E. Johnson * AnneRaymond-Savage DorothyChang-Van Horn Anton E. Lawson DorothyB. Rosenthal BAUSCH AND LOMB Sr.Angelo Collins Jane W. Lusk ThomasShellberg Rochester, New York 14602 ClaudiaDouglass BarbaraMcClintock CaroleB. Shmurak Jon R. Hendrix Neil J. McKinnon StanleyL. Weinberg TerranceL. Higgins Paul Monson Harold(Sandy) Wiper Downloaded from http://online.ucpress.edu/abt/article-pdf/42/6/44/38057/4446980.pdf by guest on 23 September 2021 *DIFCO LABORATORIES P.O.Box 1058A Detroit,Michigan 48232 PUBLICATIONSADVISORY COMMITTEE DonaldS. Dean,Chairman, Norman B. Abraham,Roy K. Baer, *ELI LILLY AND COMPANY Jane B. Kahle,Ray Ashton Indianapolis,Indiana 45206 LANE SCIENCE EQUIPMENT COMPANY BOARD OF DIRECTORS, NationalAssociation of BiologyTeachers New York, New York 10007 Officers President:Stanley D. Roth,Jr., Lawrence High School, Lawrence, KS NASCO, INC. President-Elect:Edward J. Kormondy,University of SouthernMaine, Portland, ME Fort Atkinson, Wisconsin 53538 Past-President:Manert H. Kennedy,BSCS, Boulder, CO Vice-President:Faith M. Hickman, BSCS, Boulder, CO Treasurer:Jerry Resnick, Sheepshead Bay HighSchool, Brooklyn, NY *SARGENT-WELCH SCIENTIFIC COMPANY Directors Skokie, Illinois60076 Director-at-Large:Julia Riggs, Victoria College, Victoria, TX Jane ButlerKahle, Purdue University, West Lafayette, IN PaulDeHart Hurd, Stanford University, Stanford, CA JamesL. Mariner,Fountain Valley School, Colorado Springs, CO *TRIARCH PREPARED MICROSCOPE SLIDES RegionI: David P. Lopath,Morgan High School, Clinton, CT Ripon, Wisconsin 54971 RegionII: Donald W. Humphreys, Temple University, Philadelphia, PA RegionIII: Linda Wilson, John G. Shedd Aquarium,Chicago, IL RegionIV: John Ransom,Emporia State University, Emporia, KS TURTOX RegionV: Don K.Simbeck, Loretto High School, Loretto, TN Chicago, Illinois60620 RegionVI: Jon R. Fortman,Mississippi Women's University, Columbus, MS RegionVII: Raymond Tamppari, Northern Arizona University, Flagstaff, AZ RegionVIII: Terry Armstrong,.University of Idaho, Moscow, ID RegionIX: Phillip A. Poppleton,Enumclaw High School, WA *UNITRON INSTRUMENTS, INC. Enumclaw, 101 Crossways Park West Committee Woodbury, New York 11797 Chairpersons Biologyand Society:Arnold B. Grobman,University of Missouri,St. Louis,MO Excellencein BiologyEducation: Robert F. Miller,Western New MexicoUniversity, SilverCity, NM ~WARD'S NATURAL SCIENCE PublicationsAdvisory Committee: Donald S. Dean,Baldwin-Wallace College, Berea, ESTABLISHMENT, INC. OH Rochester, New York 14603 Policy:Edward J. Kormondy,University of SouthernMaine, Portland, ME FinancialAdvisory Committee: Jerry Resnick, Sheepshead Bay HighSchool, Brook- Asterisks designate Charter Sustaining Members lyn,NY Contents Volume 42, Number 6: September 1980 AN OVERTURE Joan G. Creager 333 It'sStill Your Journal ARTICLES DarbyNelson 335 NaturalSelection, Nutrition Research, and ScienceTeaching WilliamH. Leonard 338 Usingthe ExtendedDiscretion Approach in Biology LaboratoryInvestigations Jonathan M. Bealer 342 ClassroomStudy of the Dietof a BarnOwl Thad Sitton 345 Hunter-Gatherersand HumanEcology TEACHER-TO-TEACHER Rosanne W. Fortner 349 Secretsof a Sea Necklace John H. Falk 351 TakingAdvantage of LocalResources: Laws-A Case in Point Robert A. Coler and Linda Swift 353 Demonstratingthe LimitingNutrient Content in Downloaded from http://online.ucpress.edu/abt/article-pdf/42/6/44/38057/4446980.pdf by guest on 23 September 2021 RuralRiver Reaches PERSPECTIVES FrankL. Ryan 356 On the Samenessof Things:The Worldin the Classroom Daniel Dyer 359 How to Survivethe Classof 1984 Robert E. Yager 361 Nutritionand New Goalsfor BiologicalEducation 363 LETTERS TO THE EDITOR 365 AUDIOVISUAL REVIEWS 366 BOOK REVIEWS COVER: The conventionlogo was designedby James Clintonof The MorganHigh School. Clinton, CT. The 360?full circlerepresents the 360 years (1620- 1980) sincethe pilgrimslanded in Plymouth. BostonPhotos courtesy of the GreaterBoston Tourist and ConventionBureau. American Biology Teacher, (ISSN 0002 7685) officialjournal of NABT, is published monthly except June, July, and August. InstitutionalSubscriptions $23 a year in the United States, Canada, Mexico; overseas subscription is $25 a year. Subscriptions are offered on a calendar-yearbasis; members receive all issues in the volume for the year in which their subscriptiornis entered. Advertising matters,subscription orders, and changes of address should be sent to NABT's Reston office, 11250 Roger Bacon Drive, Reston, VA 22090. All manuscriptsshould be addressed to the Editor,ABT, NABT, 11250 Roger Bacon Drive, Reston, VA 22090. Editorialcontents ?C 1980 by the National Association of Biology Teachers. Printed by InterstatePrinters, Danville, IL. Typeset by Naecker Bros., Silver Spring. MD. Second.class postage paid at Herndon, VA, and additionalmailing offices; single copy $2. NABT membership is $20 a year in the United States, Canada, and Mexico. United States student membership is $10Oayear . Articlesexpress the views of the authors and not necessarily of NABT. Announcements and advertisements