All of the following are functions of the immune system except: protecting against foreign materials or cells
detecting threats
distinguishing between a threat and healthy tissue
removal of waste

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the cover letter for a job search includes the skills one has for the particular job. including a cover letter is always a good idea, as it describes the ability to perform a task, and the employer can easily fetch the intention of the job you want to do.  

the cover letter is very important to be included in the job search document. hence, i strongly with the statement.