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Some of the preserved water may be used to identify and enumerate phytoplankton too large or rare for standard flow cytometry . A course may be repeated and benefits received only if a grade of " D " or " F " has been received , and a " C " or better is required by the department or school . A course may be repeated only once for benefits . The amount of pressure applied to the airway may be adjusted while the patient is asleep and monitored to assure adequate splinting of the airway to prevent collapse and thus attain relief of the obstruction . A standard may be adopted too quickly . Difficulty levels may be changed insofar as the pupils can attempt specialised questions on topics such as family in alternative sections in order to revise or consolidate knowledge .