Although the Carbon 14 method of dating old objects is not foolproof , it is the best method available at present
A、whollyoperationalC
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HowmanypeopleareawarethatadancerwiththeNewYorkCityBallettypicallywearsoutaminimumoftwohundredpairsoftoeshoesperyear?
Blue－greenalgaegrowabundantlyinsaltmarshes.
Incalculatingthedailycalorierequirementsforanindividual,variationsinbodysize,physicalactivity,andageshouldbetakenintoaccount.
WhileBillieHolidaydidnotinventthemusiccalled"theblues",shemostassuredlyhelpedpopularizeit.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
