Communication is one of the most important bonds that hold cultural systems together.
A、obligationsC
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In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.
Insectpestsareamongtheleadingcausesofcropfailure.
Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
Incalculatingthedailycalorierequirementsforanindividual,variationsinbodysize,physicalactivity,andageshouldbetakenintoaccount.
Eyespots,themostrudimentaryeyes,arefoundinprotozoan原生動物flagellates鞭毛蟲,flatworms扁形蟲,andsegmentedworms片段蠕蟲.
