You are presented with the question "what can put antibodies in body fluids?" and the following answer choices: 
- Chemical energy
 - animals
 - death
 - humans
 - h2o
 - immunization
 - mammals
 - collagen injections

Now knowing that passive immunity lasts only as long as the antibodies survive in body fluids and immunization can be active or passive, choose the best answer.


 

      immunization   