Question

1. 14. killed-virus vaccines are made from?

a. dead pathogens
b. pathogens grown in laboratories
c. parasites
d. bacteria

Explanation:

Killed - virus vaccines are made from pathogens that have been inactivated (killed). Option a states "Dead pathogens", which matches the definition of killed - virus vaccines. Option b is too general as not all pathogens grown in labs are used for killed - virus vaccines in the way described. Option c (parasites) and option d (bacteria) are not the correct sources for killed - virus vaccines (killed - virus vaccines are about viruses, and the key is dead pathogens).

Answer:

a. Dead pathogens