Which of the following pairs is not correctly associated?
a. killer t cells - attack and kill infected cells
b. t cells - activate killer t cells and b cells
c. b cells - engulf cells that are infected with pathogens
d. macrophages - consume pathogens and infected cells

Answer - C. B cells - Engulf cells that are infected with pathogens

Reasoning - Why the answer C is not correctly associated, is because B cells make antibiotics that respond to pathogens and foreign particles. The phagocytes is what engulf cells that are infected with pathogens. So C is not the right pairs correctly associated.

Im not sure if you still need this but the answer is 300 hz450 hz  i just did this lesson so , wish you the best of luck and take care