The future survival of the bald eagle is still an important American ecological concern.
A、migrationC
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WhileBillieHolidaydidnotinventthemusiccalled"theblues",shemostassuredlyhelpedpopularizeit.
Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.視野
In1974HenryAaronbrokeBabeRuth'smonumentallifetimerecordof714homeruns.
Eyespots, the most rudimentary eyes, are found in protozoan原生動物 flagellates 鞭毛蟲 , flatworms 扁形蟲 , and segmented worms片段 蠕蟲 .
Insectpestsareamongtheleadingcausesofcropfailure.
