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Firstly , the speed of the air is important . The American system of higher education is the envy of the world , and the competition among institutions and the current systems of accountability are major factors in this success . Air is swallowed unintentionally along with food and beverages , but it escapes either through the throat or the anus , and is not digested . The air is electric . Many are killed by oil spills and pesticides . But the affinity of pure sodium chloride for air is not so very great . The prominence of the chin is , however , a problem as there are no muscles in the chin , and the underlying bony structure does not seem likely to be affected by the relative strength of surrounding muscles . For example , Escherichia coli strain 086 presents the B antigen , and this antigen is readily recognized by anti-B antibodies in blood type A and O people , protecting them from infection .