All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.
A、asaresultofD
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TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
Incalculatingthedailycalorierequirementsforanindividual,variationsinbodysize,physicalactivity,andageshouldbetakenintoaccount.
WhileBillieHolidaydidnotinventthemusiccalled"theblues",shemostassuredlyhelpedpopularizeit.
Formulatedin1823,theMonroeDoctrineassertedthattheAmericaswerenolongeropentoEuropeancolonization.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
