Why do you think that engineering students are encouraged to think about uses for technology beyond entertaining society?

It should be b i believe

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Some responsibilities of having a checking account : write checks clearly and carefully.  keep an accurate record of checks written, so you can keep track of payments & deposits made to cover the check. maintain checks register with accuracy so as to avoid returned checks.

Lymphocytes must recognize antigen and respond to another signal generated by microbial infection to become activated.