Insectpestsareamongtheleadingcausesofcropfailure.
ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
Communicationisoneofthemostimportantbondsthatholdculturalsystemstogether.