The future survival of the bald eagle is still an important American ecological concern.
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Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.
TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.