The complement system functions to ____ and ____

a. mobilize B cells; initiate antibody production
b. help the innate immune system; turn on expression of T-cell receptor protein genes
c. destroy invading cells; provide a physical barrier against pathogens
d. destroy invading cells; guide phagocytes to the infection site
e. destroy viruses; guide phagocytes to the site of inflammation


d

Biology & Microbiology

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