Question

a vaccine can be prepared by using -a) killed germs b) living weakened germs c)fully virulent living germs d) all​

Answer 1

Answer:

d) all, but the vaccine is prepared by what are the germs present in that disease, hope it helps you if it helps you please follow me

Answer 2

hope this helps u

option  d is the answer

so because the killed germs has  use it can kill so germs and weakened germs can fight against microbes so  living germs can kill the germs

so vaccine is prepared by seeing the microbes weak